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2dd7dd3952c78e1c3bc0e512be67a359a091215f
system76-edk2/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlCodeGen.c
Pierre Gondois 2dd7dd3952 DynamicTablesPkg: Clear pointer in node creation fcts 
The following functions:
- AmlCreateRootNode()
- AmlCreateObjectNode()
- AmlCreateDataNode()
create a node and return it by populating a pointer. This pointer
should only be considered/used if the function returns successfully.
Otherwise, the value stored in this pointer should be ignored.

For their error handling, some other functions assume that this
pointer is reset to NULL if an error occurs during a node creation.
To make this assumption correct, explicitly clear this input pointer.

Reviewed-by: Sami Mujawar <sami.mujawar@arm.com>
Signed-off-by: Pierre Gondois <Pierre.Gondois@arm.com>
2021-10-08 15:39:42 +00:00

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/** @file
AML Code Generation.
Copyright (c) 2020, Arm Limited. All rights reserved.<BR>
SPDX-License-Identifier: BSD-2-Clause-Patent
**/
#include <AmlNodeDefines.h>
#include <AcpiTableGenerator.h>
#include <AmlCoreInterface.h>
#include <AmlEncoding/Aml.h>
#include <Tree/AmlNode.h>
#include <Tree/AmlTree.h>
#include <String/AmlString.h>
#include <Utils/AmlUtility.h>
/** Utility function to link a node when returning from a CodeGen function.
@param [in] Node Newly created node.
@param [in] ParentNode If provided, set ParentNode as the parent
of the node created.
@param [out] NewObjectNode If not NULL:
- and Success, contains the created Node.
- and Error, reset to NULL.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_INVALID_PARAMETER Invalid parameter.
**/
STATIC
EFI_STATUS
EFIAPI
LinkNode (
IN AML_OBJECT_NODE * Node,
IN AML_NODE_HEADER * ParentNode,
OUT AML_OBJECT_NODE ** NewObjectNode
)
{
EFI_STATUS Status;
if (NewObjectNode != NULL) {
*NewObjectNode = NULL;
}
// Add RdNode as the last element.
if (ParentNode != NULL) {
Status = AmlVarListAddTail (ParentNode, (AML_NODE_HEADER*)Node);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
}
if (NewObjectNode != NULL) {
*NewObjectNode = Node;
}
return EFI_SUCCESS;
}
/** AML code generation for DefinitionBlock.
Create a Root Node handle.
It is the caller's responsibility to free the allocated memory
with the AmlDeleteTree function.
AmlCodeGenDefinitionBlock (TableSignature, OemID, TableID, OEMRevision) is
equivalent to the following ASL code:
DefinitionBlock (AMLFileName, TableSignature, ComplianceRevision,
OemID, TableID, OEMRevision) {}
with the ComplianceRevision set to 2 and the AMLFileName is ignored.
@param[in] TableSignature 4-character ACPI signature.
Must be 'DSDT' or 'SSDT'.
@param[in] OemId 6-character string OEM identifier.
@param[in] OemTableId 8-character string OEM table identifier.
@param[in] OemRevision OEM revision number.
@param[out] NewRootNode Pointer to the root node representing a
Definition Block.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
EFI_STATUS
EFIAPI
AmlCodeGenDefinitionBlock (
IN CONST CHAR8 * TableSignature,
IN CONST CHAR8 * OemId,
IN CONST CHAR8 * OemTableId,
IN UINT32 OemRevision,
OUT AML_ROOT_NODE ** NewRootNode
)
{
EFI_STATUS Status;
EFI_ACPI_DESCRIPTION_HEADER AcpiHeader;
if ((TableSignature == NULL) ||
(OemId == NULL) ||
(OemTableId == NULL) ||
(NewRootNode == NULL)) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
CopyMem (&AcpiHeader.Signature, TableSignature, 4);
AcpiHeader.Length = sizeof (EFI_ACPI_DESCRIPTION_HEADER);
AcpiHeader.Revision = 2;
CopyMem (&AcpiHeader.OemId, OemId, 6);
CopyMem (&AcpiHeader.OemTableId, OemTableId, 8);
AcpiHeader.OemRevision = OemRevision;
AcpiHeader.CreatorId = TABLE_GENERATOR_CREATOR_ID_ARM;
AcpiHeader.CreatorRevision = CREATE_REVISION (1, 0);
Status = AmlCreateRootNode (&AcpiHeader, NewRootNode);
ASSERT_EFI_ERROR (Status);
return Status;
}
/** AML code generation for a String object node.
@param [in] String Pointer to a NULL terminated string.
@param [out] NewObjectNode If success, contains the created
String object node.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
STATIC
EFI_STATUS
EFIAPI
AmlCodeGenString (
IN CHAR8 * String,
OUT AML_OBJECT_NODE ** NewObjectNode
)
{
EFI_STATUS Status;
AML_OBJECT_NODE * ObjectNode;
AML_DATA_NODE * DataNode;
if ((String == NULL) ||
(NewObjectNode == NULL)) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
ObjectNode = NULL;
DataNode = NULL;
Status = AmlCreateObjectNode (
AmlGetByteEncodingByOpCode (AML_STRING_PREFIX, 0),
0,
&ObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
Status = AmlCreateDataNode (
EAmlNodeDataTypeString,
(UINT8*)String,
(UINT32)AsciiStrLen (String) + 1,
&DataNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler;
}
Status = AmlSetFixedArgument (
ObjectNode,
EAmlParseIndexTerm0,
(AML_NODE_HEADER*)DataNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
AmlDeleteTree ((AML_NODE_HEADER*)DataNode);
goto error_handler;
}
*NewObjectNode = ObjectNode;
return Status;
error_handler:
if (ObjectNode != NULL) {
AmlDeleteTree ((AML_NODE_HEADER*)ObjectNode);
}
return Status;
}
/** AML code generation for an Integer object node.
@param [in] Integer Integer of the Integer object node.
@param [out] NewObjectNode If success, contains the created
Integer object node.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
STATIC
EFI_STATUS
EFIAPI
AmlCodeGenInteger (
IN UINT64 Integer,
OUT AML_OBJECT_NODE ** NewObjectNode
)
{
EFI_STATUS Status;
INT8 ValueWidthDiff;
if (NewObjectNode == NULL) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
// Create an object node containing Zero.
Status = AmlCreateObjectNode (
AmlGetByteEncodingByOpCode (AML_ZERO_OP, 0),
0,
NewObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
// Update the object node with integer value.
Status = AmlNodeSetIntegerValue (*NewObjectNode, Integer, &ValueWidthDiff);
if (EFI_ERROR (Status)) {
ASSERT (0);
AmlDeleteTree ((AML_NODE_HEADER*)*NewObjectNode);
}
return Status;
}
/** AML code generation for a Name object node.
@param [in] NameString The new variable name.
Must be a NULL-terminated ASL NameString
e.g.: "DEV0", "DV15.DEV0", etc.
This input string is copied.
@param [in] Object Object associated to the NameString.
@param [in] ParentNode If provided, set ParentNode as the parent
of the node created.
@param [out] NewObjectNode If success, contains the created node.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
STATIC
EFI_STATUS
EFIAPI
AmlCodeGenName (
IN CONST CHAR8 * NameString,
IN AML_OBJECT_NODE * Object,
IN AML_NODE_HEADER * ParentNode, OPTIONAL
OUT AML_OBJECT_NODE ** NewObjectNode OPTIONAL
)
{
EFI_STATUS Status;
AML_OBJECT_NODE * ObjectNode;
AML_DATA_NODE * DataNode;
CHAR8 * AmlNameString;
UINT32 AmlNameStringSize;
if ((NameString == NULL) ||
(Object == NULL) ||
((ParentNode == NULL) && (NewObjectNode == NULL))) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
ObjectNode = NULL;
DataNode = NULL;
AmlNameString = NULL;
Status = ConvertAslNameToAmlName (NameString, &AmlNameString);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler1;
}
Status = AmlCreateObjectNode (
AmlGetByteEncodingByOpCode (AML_NAME_OP, 0),
0,
&ObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler1;
}
Status = AmlCreateDataNode (
EAmlNodeDataTypeNameString,
(UINT8*)AmlNameString,
AmlNameStringSize,
&DataNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler2;
}
Status = AmlSetFixedArgument (
ObjectNode,
EAmlParseIndexTerm0,
(AML_NODE_HEADER*)DataNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
AmlDeleteTree ((AML_NODE_HEADER*)DataNode);
goto error_handler2;
}
Status = AmlSetFixedArgument (
ObjectNode,
EAmlParseIndexTerm1,
(AML_NODE_HEADER*)Object
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler2;
}
Status = LinkNode (
ObjectNode,
ParentNode,
NewObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler2;
}
// Free AmlNameString before returning as it is copied
// in the call to AmlCreateDataNode().
goto error_handler1;
error_handler2:
if (ObjectNode != NULL) {
AmlDeleteTree ((AML_NODE_HEADER*)ObjectNode);
}
error_handler1:
if (AmlNameString != NULL) {
FreePool (AmlNameString);
}
return Status;
}
/** AML code generation for a Name object node, containing a String.
AmlCodeGenNameString ("_HID", "HID0000", ParentNode, NewObjectNode) is
equivalent of the following ASL code:
Name(_HID, "HID0000")
@param [in] NameString The new variable name.
Must be a NULL-terminated ASL NameString
e.g.: "DEV0", "DV15.DEV0", etc.
The input string is copied.
@param [in] String NULL terminated String to associate to the
NameString.
@param [in] ParentNode If provided, set ParentNode as the parent
of the node created.
@param [out] NewObjectNode If success, contains the created node.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
EFI_STATUS
EFIAPI
AmlCodeGenNameString (
IN CONST CHAR8 * NameString,
IN CHAR8 * String,
IN AML_NODE_HEADER * ParentNode, OPTIONAL
OUT AML_OBJECT_NODE ** NewObjectNode OPTIONAL
)
{
EFI_STATUS Status;
AML_OBJECT_NODE * ObjectNode;
if ((NameString == NULL) ||
(String == NULL) ||
((ParentNode == NULL) && (NewObjectNode == NULL))) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
Status = AmlCodeGenString (String, &ObjectNode);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
Status = AmlCodeGenName (
NameString,
ObjectNode,
ParentNode,
NewObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
AmlDeleteTree ((AML_NODE_HEADER*)ObjectNode);
}
return Status;
}
/** AML code generation for a Name object node, containing an Integer.
AmlCodeGenNameInteger ("_UID", 1, ParentNode, NewObjectNode) is
equivalent of the following ASL code:
Name(_UID, One)
@param [in] NameString The new variable name.
Must be a NULL-terminated ASL NameString
e.g.: "DEV0", "DV15.DEV0", etc.
The input string is copied.
@param [in] Integer Integer to associate to the NameString.
@param [in] ParentNode If provided, set ParentNode as the parent
of the node created.
@param [out] NewObjectNode If success, contains the created node.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
EFI_STATUS
EFIAPI
AmlCodeGenNameInteger (
IN CONST CHAR8 * NameString,
IN UINT64 Integer,
IN AML_NODE_HEADER * ParentNode, OPTIONAL
OUT AML_OBJECT_NODE ** NewObjectNode OPTIONAL
)
{
EFI_STATUS Status;
AML_OBJECT_NODE * ObjectNode;
if ((NameString == NULL) ||
((ParentNode == NULL) && (NewObjectNode == NULL))) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
Status = AmlCodeGenInteger (Integer, &ObjectNode);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
Status = AmlCodeGenName (
NameString,
ObjectNode,
ParentNode,
NewObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
AmlDeleteTree ((AML_NODE_HEADER*)ObjectNode);
}
return Status;
}
/** AML code generation for a Device object node.
AmlCodeGenDevice ("COM0", ParentNode, NewObjectNode) is
equivalent of the following ASL code:
Device(COM0) {}
@param [in] NameString The new Device's name.
Must be a NULL-terminated ASL NameString
e.g.: "DEV0", "DV15.DEV0", etc.
The input string is copied.
@param [in] ParentNode If provided, set ParentNode as the parent
of the node created.
@param [out] NewObjectNode If success, contains the created node.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
EFI_STATUS
EFIAPI
AmlCodeGenDevice (
IN CONST CHAR8 * NameString,
IN AML_NODE_HEADER * ParentNode, OPTIONAL
OUT AML_OBJECT_NODE ** NewObjectNode OPTIONAL
)
{
EFI_STATUS Status;
AML_OBJECT_NODE * ObjectNode;
AML_DATA_NODE * DataNode;
CHAR8 * AmlNameString;
UINT32 AmlNameStringSize;
if ((NameString == NULL) ||
((ParentNode == NULL) && (NewObjectNode == NULL))) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
ObjectNode = NULL;
DataNode = NULL;
AmlNameString = NULL;
Status = ConvertAslNameToAmlName (NameString, &AmlNameString);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler1;
}
Status = AmlCreateObjectNode (
AmlGetByteEncodingByOpCode (AML_EXT_OP, AML_EXT_DEVICE_OP),
AmlNameStringSize + AmlComputePkgLengthWidth (AmlNameStringSize),
&ObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler1;
}
Status = AmlCreateDataNode (
EAmlNodeDataTypeNameString,
(UINT8*)AmlNameString,
AmlNameStringSize,
&DataNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler2;
}
Status = AmlSetFixedArgument (
ObjectNode,
EAmlParseIndexTerm0,
(AML_NODE_HEADER*)DataNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
AmlDeleteTree ((AML_NODE_HEADER*)DataNode);
goto error_handler2;
}
Status = LinkNode (
ObjectNode,
ParentNode,
NewObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler2;
}
// Free AmlNameString before returning as it is copied
// in the call to AmlCreateDataNode().
goto error_handler1;
error_handler2:
if (ObjectNode != NULL) {
AmlDeleteTree ((AML_NODE_HEADER*)ObjectNode);
}
error_handler1:
if (AmlNameString != NULL) {
FreePool (AmlNameString);
}
return Status;
}
/** AML code generation for a Scope object node.
AmlCodeGenScope ("_SB", ParentNode, NewObjectNode) is
equivalent of the following ASL code:
Scope(_SB) {}
@param [in] NameString The new Scope's name.
Must be a NULL-terminated ASL NameString
e.g.: "DEV0", "DV15.DEV0", etc.
The input string is copied.
@param [in] ParentNode If provided, set ParentNode as the parent
of the node created.
@param [out] NewObjectNode If success, contains the created node.
@retval EFI_SUCCESS Success.
@retval EFI_INVALID_PARAMETER Invalid parameter.
@retval EFI_OUT_OF_RESOURCES Failed to allocate memory.
**/
EFI_STATUS
EFIAPI
AmlCodeGenScope (
IN CONST CHAR8 * NameString,
IN AML_NODE_HEADER * ParentNode, OPTIONAL
OUT AML_OBJECT_NODE ** NewObjectNode OPTIONAL
)
{
EFI_STATUS Status;
AML_OBJECT_NODE * ObjectNode;
AML_DATA_NODE * DataNode;
CHAR8 * AmlNameString;
UINT32 AmlNameStringSize;
if ((NameString == NULL) ||
((ParentNode == NULL) && (NewObjectNode == NULL))) {
ASSERT (0);
return EFI_INVALID_PARAMETER;
}
ObjectNode = NULL;
DataNode = NULL;
AmlNameString = NULL;
Status = ConvertAslNameToAmlName (NameString, &AmlNameString);
if (EFI_ERROR (Status)) {
ASSERT (0);
return Status;
}
Status = AmlGetNameStringSize (AmlNameString, &AmlNameStringSize);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler1;
}
Status = AmlCreateObjectNode (
AmlGetByteEncodingByOpCode (AML_SCOPE_OP, 0),
AmlNameStringSize + AmlComputePkgLengthWidth (AmlNameStringSize),
&ObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler1;
}
Status = AmlCreateDataNode (
EAmlNodeDataTypeNameString,
(UINT8*)AmlNameString,
AmlNameStringSize,
&DataNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler2;
}
Status = AmlSetFixedArgument (
ObjectNode,
EAmlParseIndexTerm0,
(AML_NODE_HEADER*)DataNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
AmlDeleteTree ((AML_NODE_HEADER*)DataNode);
goto error_handler2;
}
Status = LinkNode (
ObjectNode,
ParentNode,
NewObjectNode
);
if (EFI_ERROR (Status)) {
ASSERT (0);
goto error_handler2;
}
// Free AmlNameString before returning as it is copied
// in the call to AmlCreateDataNode().
goto error_handler1;
error_handler2:
if (ObjectNode != NULL) {
AmlDeleteTree ((AML_NODE_HEADER*)ObjectNode);
}
error_handler1:
if (AmlNameString != NULL) {
FreePool (AmlNameString);
}
return Status;
}
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