system76-edk2/DynamicTablesPkg/Library/Common/AmlLib/CodeGen/AmlResourceDataCodeGen.c

/** @file
  AML Resource Data Code Generation.

  Copyright (c) 2020 - 2021, Arm Limited. All rights reserved.<BR>

  SPDX-License-Identifier: BSD-2-Clause-Patent

  @par Glossary:
  - Rd or RD   - Resource Data
  - Rds or RDS - Resource Data Small
  - Rdl or RDL - Resource Data Large
**/

#include <AmlNodeDefines.h>
#include <CodeGen/AmlResourceDataCodeGen.h>

#include <AmlCoreInterface.h>
#include <AmlDefines.h>
#include <Api/AmlApiHelper.h>
#include <Tree/AmlNode.h>
#include <ResourceData/AmlResourceData.h>

/** If ParentNode is not NULL, append RdNode.
    If NewRdNode is not NULL, update its value to RdNode.

  @param [in]  RdNode       Newly created Resource Data node.
                            RdNode is deleted if an error occurs.
  @param [in]  ParentNode   If not NULL, ParentNode must:
                             - be a NameOp node, i.e. have the AML_NAME_OP
                               opcode (cf "Name ()" ASL statement)
                             - contain a list of resource data elements
                               (cf "ResourceTemplate ()" ASL statement)
                            RdNode is then added at the end of the variable
                            list of resource data elements, but before the
                            "End Tag" Resource Data.
  @param [out] NewRdNode    If not NULL:
                             - and Success, contains RdNode.
                             - and Error, reset to NULL.

  @retval  EFI_SUCCESS            The function completed successfully.
  @retval  EFI_INVALID_PARAMETER  Invalid parameter.
**/
STATIC
EFI_STATUS
EFIAPI
LinkRdNode (
  IN  AML_DATA_NODE    *RdNode,
  IN  AML_OBJECT_NODE  *ParentNode,
  OUT AML_DATA_NODE    **NewRdNode
  )
{
  EFI_STATUS       Status;
  EFI_STATUS       Status1;
  AML_OBJECT_NODE  *BufferOpNode;

  if (NewRdNode != NULL) {
    *NewRdNode = NULL;
  }

  if (ParentNode != NULL) {
    // Check this is a NameOp node.
    if ((!AmlNodeHasOpCode (ParentNode, AML_NAME_OP, 0))) {
      ASSERT (0);
      Status = EFI_INVALID_PARAMETER;
      goto error_handler;
    }

    // Get the value which is represented as a BufferOp object node
    // which is the 2nd fixed argument (i.e. index 1).
    BufferOpNode = (AML_OBJECT_NODE_HANDLE)AmlGetFixedArgument (
                                             ParentNode,
                                             EAmlParseIndexTerm1
                                             );
    if ((BufferOpNode == NULL)                                             ||
        (AmlGetNodeType ((AML_NODE_HANDLE)BufferOpNode) != EAmlNodeObject) ||
        (!AmlNodeHasOpCode (BufferOpNode, AML_BUFFER_OP, 0)))
    {
      ASSERT (0);
      Status = EFI_INVALID_PARAMETER;
      goto error_handler;
    }

    // Add RdNode as the last element, but before the EndTag.
    Status = AmlAppendRdNode (BufferOpNode, RdNode);
    if (EFI_ERROR (Status)) {
      ASSERT (0);
      goto error_handler;
    }
  }

  if (NewRdNode != NULL) {
    *NewRdNode = RdNode;
  }

  return EFI_SUCCESS;

error_handler:
  Status1 = AmlDeleteTree ((AML_NODE_HEADER *)RdNode);
  ASSERT_EFI_ERROR (Status1);
  // Return original error.
  return Status;
}

/** Code generation for the "Interrupt ()" ASL function.

  The Resource Data effectively created is an Extended Interrupt Resource
  Data. Cf ACPI 6.4:
   - s6.4.3.6 "Extended Interrupt Descriptor"
   - s19.6.64 "Interrupt (Interrupt Resource Descriptor Macro)"

  The created resource data node can be:
   - appended to the list of resource data elements of the NameOpNode.
     In such case NameOpNode must be defined by a the "Name ()" ASL statement
     and initially contain a "ResourceTemplate ()".
   - returned through the NewRdNode parameter.

  @param  [in]  ResourceConsumer The device consumes the specified interrupt
                                 or produces it for use by a child device.
  @param  [in]  EdgeTriggered    The interrupt is edge triggered or
                                 level triggered.
  @param  [in]  ActiveLow        The interrupt is active-high or active-low.
  @param  [in]  Shared           The interrupt can be shared with other
                                 devices or not (Exclusive).
  @param  [in]  IrqList          Interrupt list. Must be non-NULL.
  @param  [in]  IrqCount         Interrupt count. Must be non-zero.
  @param  [in]  NameOpNode       NameOp object node defining a named object.
                                 If provided, append the new resource data node
                                 to the list of resource data elements of this
                                 node.
  @param  [out] NewRdNode        If provided and success,
                                 contain the created 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
AmlCodeGenRdInterrupt (
  IN  BOOLEAN                 ResourceConsumer,
  IN  BOOLEAN                 EdgeTriggered,
  IN  BOOLEAN                 ActiveLow,
  IN  BOOLEAN                 Shared,
  IN  UINT32                  *IrqList,
  IN  UINT8                   IrqCount,
  IN  AML_OBJECT_NODE_HANDLE  NameOpNode  OPTIONAL,
  OUT AML_DATA_NODE_HANDLE    *NewRdNode  OPTIONAL
  )
{
  EFI_STATUS  Status;

  AML_DATA_NODE                           *RdNode;
  EFI_ACPI_EXTENDED_INTERRUPT_DESCRIPTOR  RdInterrupt;
  UINT32                                  *FirstInterrupt;

  if ((IrqList == NULL) ||
      (IrqCount == 0)   ||
      ((NameOpNode == NULL) && (NewRdNode == NULL)))
  {
    ASSERT (0);
    return EFI_INVALID_PARAMETER;
  }

  // Header
  RdInterrupt.Header.Header.Bits.Name =
    ACPI_LARGE_EXTENDED_IRQ_DESCRIPTOR_NAME;
  RdInterrupt.Header.Header.Bits.Type = ACPI_LARGE_ITEM_FLAG;
  RdInterrupt.Header.Length           = sizeof (EFI_ACPI_EXTENDED_INTERRUPT_DESCRIPTOR) -
                                        sizeof (ACPI_LARGE_RESOURCE_HEADER);

  // Body
  RdInterrupt.InterruptVectorFlags = (ResourceConsumer ? BIT0 : 0) |
                                     (EdgeTriggered ? BIT1 : 0)    |
                                     (ActiveLow ? BIT2 : 0)        |
                                     (Shared ? BIT3 : 0);
  RdInterrupt.InterruptTableLength = IrqCount;

  // Get the address of the first interrupt field.
  FirstInterrupt = RdInterrupt.InterruptNumber;

  // Copy the list of interrupts.
  CopyMem (FirstInterrupt, IrqList, (sizeof (UINT32) * IrqCount));

  Status = AmlCreateDataNode (
             EAmlNodeDataTypeResourceData,
             (UINT8 *)&RdInterrupt,
             sizeof (EFI_ACPI_EXTENDED_INTERRUPT_DESCRIPTOR),
             &RdNode
             );
  if (EFI_ERROR (Status)) {
    ASSERT (0);
    return Status;
  }

  return LinkRdNode (RdNode, NameOpNode, NewRdNode);
}

/** Code generation for the "Register ()" ASL function.

  The Resource Data effectively created is a Generic Register Descriptor.
  Data. Cf ACPI 6.4:
   - s6.4.3.7 "Generic Register Descriptor".
   - s19.6.114 "Register".

  The created resource data node can be:
   - appended to the list of resource data elements of the NameOpNode.
     In such case NameOpNode must be defined by a the "Name ()" ASL statement
     and initially contain a "ResourceTemplate ()".
   - returned through the NewRdNode parameter.

  @param [in]  AddressSpace    Address space where the register exists.
                               Can be one of I/O space, System Memory, etc.
  @param [in]  BitWidth        Number of bits in the register.
  @param [in]  BitOffset       Offset in bits from the start of the register
                               indicated by the Address.
  @param [in]  Address         Register address.
  @param [in]  AccessSize      Size of data values used when accessing the
                               address space. Can be one of:
                                 0 - Undefined, legacy (EFI_ACPI_6_4_UNDEFINED)
                                 1 - Byte access (EFI_ACPI_6_4_BYTE)
                                 2 - Word access (EFI_ACPI_6_4_WORD)
                                 3 - DWord access (EFI_ACPI_6_4_DWORD)
                                 4 - QWord access (EFI_ACPI_6_4_QWORD)
  @param  [in]  NameOpNode       NameOp object node defining a named object.
                                 If provided, append the new resource data node
                                 to the list of resource data elements of this
                                 node.
  @param  [out] NewRdNode        If provided and success,
                                 contain the created 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
AmlCodeGenRdRegister (
  IN  UINT8                   AddressSpace,
  IN  UINT8                   BitWidth,
  IN  UINT8                   BitOffset,
  IN  UINT64                  Address,
  IN  UINT8                   AccessSize,
  IN  AML_OBJECT_NODE_HANDLE  NameOpNode  OPTIONAL,
  OUT AML_DATA_NODE_HANDLE    *NewRdNode  OPTIONAL
  )
{
  EFI_STATUS                            Status;
  AML_DATA_NODE                         *RdNode;
  EFI_ACPI_GENERIC_REGISTER_DESCRIPTOR  RdRegister;

  if ((AccessSize > EFI_ACPI_6_4_QWORD)  ||
      ((NameOpNode == NULL) && (NewRdNode == NULL)))
  {
    ASSERT (0);
    return EFI_INVALID_PARAMETER;
  }

  // Header
  RdRegister.Header.Header.Bits.Name =
    ACPI_LARGE_GENERIC_REGISTER_DESCRIPTOR_NAME;
  RdRegister.Header.Header.Bits.Type = ACPI_LARGE_ITEM_FLAG;
  RdRegister.Header.Length           = sizeof (EFI_ACPI_GENERIC_REGISTER_DESCRIPTOR) -
                                       sizeof (ACPI_LARGE_RESOURCE_HEADER);

  // Body
  RdRegister.AddressSpaceId    = AddressSpace;
  RdRegister.RegisterBitWidth  = BitWidth;
  RdRegister.RegisterBitOffset = BitOffset;
  RdRegister.AddressSize       = AccessSize;
  RdRegister.RegisterAddress   = Address;

  Status = AmlCreateDataNode (
             EAmlNodeDataTypeResourceData,
             (UINT8 *)&RdRegister,
             sizeof (EFI_ACPI_GENERIC_REGISTER_DESCRIPTOR),
             &RdNode
             );
  if (EFI_ERROR (Status)) {
    ASSERT (0);
    return Status;
  }

  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

/** DEPRECATED API

  Add an Interrupt Resource Data node.

  This function creates a Resource Data element corresponding to the
  "Interrupt ()" ASL function, stores it in an AML Data Node.

  It then adds it after the input CurrRdNode in the list of resource data
  element.

  The Resource Data effectively created is an Extended Interrupt Resource
  Data. See ACPI 6.3 specification, s6.4.3.6 "Extended Interrupt Descriptor"
  for more information about Extended Interrupt Resource Data.

  The Extended Interrupt contains one single interrupt.

  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.

  Note: The _CRS node must be defined using the ASL Name () function.
        e.g. Name (_CRS, ResourceTemplate () {
               ...
             }

  @ingroup UserApis

  @param  [in]  NameOpCrsNode    NameOp object node defining a "_CRS" object.
                                 Must have an OpCode=AML_NAME_OP, SubOpCode=0.
                                 NameOp object nodes are defined in ASL
                                 using the "Name ()" function.
  @param  [in]  ResourceConsumer The device consumes the specified interrupt
                                 or produces it for use by a child device.
  @param  [in]  EdgeTriggered    The interrupt is edge triggered or
                                 level triggered.
  @param  [in]  ActiveLow        The interrupt is active-high or active-low.
  @param  [in]  Shared           The interrupt can be shared with other
                                 devices or not (Exclusive).
  @param  [in]  IrqList          Interrupt list. Must be non-NULL.
  @param  [in]  IrqCount         Interrupt count. Must be non-zero.


  @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
AmlCodeGenCrsAddRdInterrupt (
  IN  AML_OBJECT_NODE_HANDLE  NameOpCrsNode,
  IN  BOOLEAN                 ResourceConsumer,
  IN  BOOLEAN                 EdgeTriggered,
  IN  BOOLEAN                 ActiveLow,
  IN  BOOLEAN                 Shared,
  IN  UINT32                  *IrqList,
  IN  UINT8                   IrqCount
  )
{
  return AmlCodeGenRdInterrupt (
           ResourceConsumer,
           EdgeTriggered,
           ActiveLow,
           Shared,
           IrqList,
           IrqCount,
           NameOpCrsNode,
           NULL
           );
}

#endif // DISABLE_NEW_DEPRECATED_INTERFACES