/** @file
  ACPI Sdt Protocol Driver

  Copyright (c) 2010, Intel Corporation. All rights reserved. <BR>
  This program and the accompanying materials
  are licensed and made available under the terms and conditions of the BSD License
  which accompanies this distribution.  The full text of the license may be found at
  http://opensource.org/licenses/bsd-license.php

  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.

**/

#ifndef _ACPI_SDT_H_
#define _ACPI_SDT_H_

//
// ACPI AML definition
//

//
// Primary OpCode
//
#define AML_ZERO_OP                  0x00
#define AML_ONE_OP                   0x01
#define AML_ALIAS_OP                 0x06
#define AML_NAME_OP                  0x08
#define AML_BYTE_PREFIX              0x0a
#define AML_WORD_PREFIX              0x0b
#define AML_DWORD_PREFIX             0x0c
#define AML_STRING_PREFIX            0x0d
#define AML_QWORD_PREFIX             0x0e
#define AML_SCOPE_OP                 0x10
#define AML_BUFFER_OP                0x11
#define AML_PACKAGE_OP               0x12
#define AML_VAR_PACKAGE_OP           0x13
#define AML_METHOD_OP                0x14
#define AML_DUAL_NAME_PREFIX         0x2e
#define AML_MULTI_NAME_PREFIX        0x2f
#define AML_NAME_CHAR_A              0x41
#define AML_NAME_CHAR_B              0x42
#define AML_NAME_CHAR_C              0x43
#define AML_NAME_CHAR_D              0x44
#define AML_NAME_CHAR_E              0x45
#define AML_NAME_CHAR_F              0x46
#define AML_NAME_CHAR_G              0x47
#define AML_NAME_CHAR_H              0x48
#define AML_NAME_CHAR_I              0x49
#define AML_NAME_CHAR_J              0x4a
#define AML_NAME_CHAR_K              0x4b
#define AML_NAME_CHAR_L              0x4c
#define AML_NAME_CHAR_M              0x4d
#define AML_NAME_CHAR_N              0x4e
#define AML_NAME_CHAR_O              0x4f
#define AML_NAME_CHAR_P              0x50
#define AML_NAME_CHAR_Q              0x51
#define AML_NAME_CHAR_R              0x52
#define AML_NAME_CHAR_S              0x53
#define AML_NAME_CHAR_T              0x54
#define AML_NAME_CHAR_U              0x55
#define AML_NAME_CHAR_V              0x56
#define AML_NAME_CHAR_W              0x57
#define AML_NAME_CHAR_X              0x58
#define AML_NAME_CHAR_Y              0x59
#define AML_NAME_CHAR_Z              0x5a
#define AML_ROOT_CHAR                0x5c
#define AML_PARENT_PREFIX_CHAR       0x5e
#define AML_NAME_CHAR__              0x5f
#define AML_LOCAL0                   0x60
#define AML_LOCAL1                   0x61
#define AML_LOCAL2                   0x62
#define AML_LOCAL3                   0x63
#define AML_LOCAL4                   0x64
#define AML_LOCAL5                   0x65
#define AML_LOCAL6                   0x66
#define AML_LOCAL7                   0x67
#define AML_ARG0                     0x68
#define AML_ARG1                     0x69
#define AML_ARG2                     0x6a
#define AML_ARG3                     0x6b
#define AML_ARG4                     0x6c
#define AML_ARG5                     0x6d
#define AML_ARG6                     0x6e
#define AML_STORE_OP                 0x70
#define AML_REF_OF_OP                0x71
#define AML_ADD_OP                   0x72
#define AML_CONCAT_OP                0x73
#define AML_SUBTRACT_OP              0x74
#define AML_INCREMENT_OP             0x75
#define AML_DECREMENT_OP             0x76
#define AML_MULTIPLY_OP              0x77
#define AML_DIVIDE_OP                0x78
#define AML_SHIFT_LEFT_OP            0x79
#define AML_SHIFT_RIGHT_OP           0x7a
#define AML_AND_OP                   0x7b
#define AML_NAND_OP                  0x7c
#define AML_OR_OP                    0x7d
#define AML_NOR_OP                   0x7e
#define AML_XOR_OP                   0x7f
#define AML_NOT_OP                   0x80
#define AML_FIND_SET_LEFT_BIT_OP     0x81
#define AML_FIND_SET_RIGHT_BIT_OP    0x82
#define AML_DEREF_OF_OP              0x83
#define AML_CONCAT_RES_OP            0x84
#define AML_MOD_OP                   0x85
#define AML_NOTIFY_OP                0x86
#define AML_SIZE_OF_OP               0x87
#define AML_INDEX_OP                 0x88
#define AML_MATCH_OP                 0x89
#define AML_CREATE_DWORD_FIELD_OP    0x8a
#define AML_CREATE_WORD_FIELD_OP     0x8b
#define AML_CREATE_BYTE_FIELD_OP     0x8c
#define AML_CREATE_BIT_FIELD_OP      0x8d
#define AML_OBJECT_TYPE_OP           0x8e
#define AML_CREATE_QWORD_FIELD_OP    0x8f
#define AML_LAND_OP                  0x90
#define AML_LOR_OP                   0x91
#define AML_LNOT_OP                  0x92
#define AML_LEQUAL_OP                0x93
#define AML_LGREATER_OP              0x94
#define AML_LLESS_OP                 0x95
#define AML_TO_BUFFER_OP             0x96
#define AML_TO_DEC_STRING_OP         0x97
#define AML_TO_HEX_STRING_OP         0x98
#define AML_TO_INTEGER_OP            0x99
#define AML_TO_STRING_OP             0x9c
#define AML_COPY_OBJECT_OP           0x9d
#define AML_MID_OP                   0x9e
#define AML_CONTINUE_OP              0x9f
#define AML_IF_OP                    0xa0
#define AML_ELSE_OP                  0xa1
#define AML_WHILE_OP                 0xa2
#define AML_NOOP_OP                  0xa3
#define AML_RETURN_OP                0xa4
#define AML_BREAK_OP                 0xa5
#define AML_BREAK_POINT_OP           0xcc
#define AML_ONES_OP                  0xff

//
// Extended OpCode
//
#define AML_EXT_OP                   0x5b

#define AML_EXT_MUTEX_OP             0x01
#define AML_EXT_EVENT_OP             0x02
#define AML_EXT_COND_REF_OF_OP       0x12
#define AML_EXT_CREATE_FIELD_OP      0x13
#define AML_EXT_LOAD_TABLE_OP        0x1f
#define AML_EXT_LOAD_OP              0x20
#define AML_EXT_STALL_OP             0x21
#define AML_EXT_SLEEP_OP             0x22
#define AML_EXT_ACQUIRE_OP           0x23
#define AML_EXT_SIGNAL_OP            0x24
#define AML_EXT_WAIT_OP              0x25
#define AML_EXT_RESET_OP             0x26
#define AML_EXT_RELEASE_OP           0x27
#define AML_EXT_FROM_BCD_OP          0x28
#define AML_EXT_TO_BCD_OP            0x29
#define AML_EXT_UNLOAD_OP            0x2a
#define AML_EXT_REVISION_OP          0x30
#define AML_EXT_DEBUG_OP             0x31
#define AML_EXT_FATAL_OP             0x32
#define AML_EXT_TIMER_OP             0x33
#define AML_EXT_REGION_OP            0x80
#define AML_EXT_FIELD_OP             0x81
#define AML_EXT_DEVICE_OP            0x82
#define AML_EXT_PROCESSOR_OP         0x83
#define AML_EXT_POWER_RES_OP         0x84
#define AML_EXT_THERMAL_ZONE_OP      0x85
#define AML_EXT_INDEX_FIELD_OP       0x86
#define AML_EXT_BANK_FIELD_OP        0x87
#define AML_EXT_DATA_REGION_OP       0x88

//
// Privacy data structure
//

//
// ACPI Notify Linked List Signature.
//
#define EFI_ACPI_NOTIFY_LIST_SIGNATURE SIGNATURE_32 ('E', 'A', 'N', 'L')

//
// ACPI Notify List Entry definition.
//
//  Signature must be set to EFI_ACPI_NOTIFY_LIST_SIGNATURE
//  Link is the linked list data.
//  Notification is the callback function.
//
typedef struct {
  UINT32                   Signature;
  LIST_ENTRY               Link;
  EFI_ACPI_NOTIFICATION_FN Notification;
} EFI_ACPI_NOTIFY_LIST;

//
// Containment record for ACPI Notify linked list.
//
#define EFI_ACPI_NOTIFY_LIST_FROM_LINK(_link)  CR (_link, EFI_ACPI_NOTIFY_LIST, Link, EFI_ACPI_NOTIFY_LIST_SIGNATURE)

typedef struct _AML_BYTE_ENCODING AML_BYTE_ENCODING;
typedef struct _EFI_AML_NODE_LIST EFI_AML_NODE_LIST;

//
// AML Node Linked List Signature.
//
#define EFI_AML_NODE_LIST_SIGNATURE SIGNATURE_32 ('E', 'A', 'M', 'L')

//
// AML Node Linked List Entry definition.
//
//  Signature must be set to EFI_AML_NODE_LIST_SIGNATURE
//  Link is the linked list data.
//  Name is the ACPI node name.
//         This is listed for PATH finding.
//  Buffer is the ACPI node buffer pointer, the first/second bytes are opcode.
//         This buffer should not be freed.
//  Size is the total size of this ACPI node buffer.
//  Children is the children linked list of this node.
//
#define AML_NAME_SEG_SIZE  4

struct _EFI_AML_NODE_LIST {
  UINT32                  Signature;
  UINT8                   Name[AML_NAME_SEG_SIZE];
  UINT8                   *Buffer;
  UINTN                   Size;
  LIST_ENTRY              Link;
  LIST_ENTRY              Children;
  EFI_AML_NODE_LIST       *Parent;
  AML_BYTE_ENCODING       *AmlByteEncoding;
};

//
// Containment record for AML Node linked list.
//
#define EFI_AML_NODE_LIST_FROM_LINK(_link)  CR (_link, EFI_AML_NODE_LIST, Link, EFI_AML_NODE_LIST_SIGNATURE)

//
// AML Handle Signature.
//
#define EFI_AML_HANDLE_SIGNATURE SIGNATURE_32 ('E', 'A', 'H', 'S')
#define EFI_AML_ROOT_HANDLE_SIGNATURE SIGNATURE_32 ('E', 'A', 'R', 'H')

//
// AML Handle Entry definition.
//
//  Signature must be set to EFI_AML_HANDLE_SIGNATURE or EFI_AML_ROOT_HANDLE_SIGNATURE
//  Buffer is the ACPI node buffer pointer, the first/second bytes are opcode.
//         This buffer should not be freed.
//  Size is the total size of this ACPI node buffer.
//
typedef struct {
  UINT32                  Signature;
  UINT8                   *Buffer;
  UINTN                   Size;
  AML_BYTE_ENCODING       *AmlByteEncoding;
  BOOLEAN                 Modified;
} EFI_AML_HANDLE;

typedef UINT32 AML_OP_PARSE_INDEX;

#define AML_OP_PARSE_INDEX_GET_OPCODE     0
#define AML_OP_PARSE_INDEX_GET_TERM1      1
#define AML_OP_PARSE_INDEX_GET_TERM2      2
#define AML_OP_PARSE_INDEX_GET_TERM3      3
#define AML_OP_PARSE_INDEX_GET_TERM4      4
#define AML_OP_PARSE_INDEX_GET_TERM5      5
#define AML_OP_PARSE_INDEX_GET_TERM6      6
#define AML_OP_PARSE_INDEX_GET_SIZE       (AML_OP_PARSE_INDEX)-1

typedef UINT32 AML_OP_PARSE_FORMAT;
#define AML_NONE         0
#define AML_OPCODE       1
#define AML_UINT8        2
#define AML_UINT16       3
#define AML_UINT32       4
#define AML_UINT64       5
#define AML_NAME         6
#define AML_STRING       7
#define AML_OBJECT       8

typedef UINT32 AML_OP_ATTRIBUTE;
#define AML_HAS_PKG_LENGTH       0x1     // It is ACPI attribute - if OpCode has PkgLength
#define AML_IS_NAME_CHAR         0x2     // It is ACPI attribute - if this is NameChar
#define AML_HAS_CHILD_OBJ        0x4     // it is ACPI attribute - if OpCode has Child Object.
#define AML_IN_NAMESPACE         0x10000 // It is UEFI SDT attribute - if OpCode will be in NameSpace
                                         // NOTE; Not all OBJECT will be in NameSpace
                                         // For example, BankField | CreateBitField | CreateByteField | CreateDWordField | 
                                         //   CreateField | CreateQWordField | CreateWordField | Field | IndexField.

struct _AML_BYTE_ENCODING {
  UINT8                      OpCode;
  UINT8                      SubOpCode;
  AML_OP_PARSE_INDEX         MaxIndex;
  AML_OP_PARSE_FORMAT        Format[6];
  AML_OP_ATTRIBUTE           Attribute;
};

//
// AcpiSdt protocol declaration
//

/**
  Returns a requested ACPI table.
  
  The GetAcpiTable() function returns a pointer to a buffer containing the ACPI table associated
  with the Index that was input. The following structures are not considered elements in the list of
  ACPI tables:
  - Root System Description Pointer (RSD_PTR)
  - Root System Description Table (RSDT)
  - Extended System Description Table (XSDT)
  Version is updated with a bit map containing all the versions of ACPI of which the table is a
  member.
  
  @param[in]    Index       The zero-based index of the table to retrieve.
  @param[out]   Table       Pointer for returning the table buffer.
  @param[out]   Version     On return, updated with the ACPI versions to which this table belongs. Type
                            EFI_ACPI_TABLE_VERSION is defined in "Related Definitions" in the
                            EFI_ACPI_SDT_PROTOCOL.    
  @param[out]   TableKey    On return, points to the table key for the specified ACPI system definition table. This
                            is identical to the table key used in the EFI_ACPI_TABLE_PROTOCOL.  
                            
  @retval EFI_SUCCESS       The function completed successfully.
  @retval EFI_NOT_FOUND     The requested index is too large and a table was not found.                                  
**/  
EFI_STATUS
EFIAPI
GetAcpiTable2 (
  IN  UINTN                               Index,
  OUT EFI_ACPI_SDT_HEADER                 **Table,
  OUT EFI_ACPI_TABLE_VERSION              *Version,
  OUT UINTN                               *TableKey
  );

/**
  Register or unregister a callback when an ACPI table is installed.
  
  This function registers or unregisters a function which will be called whenever a new ACPI table is
  installed.
  
  @param[in]    Register        If TRUE, then the specified function will be registered. If FALSE, then the specified
                                function will be unregistered.
  @param[in]    Notification    Points to the callback function to be registered or unregistered.
  
  @retval EFI_SUCCESS           Callback successfully registered or unregistered.
  @retval EFI_INVALID_PARAMETER Notification is NULL
  @retval EFI_INVALID_PARAMETER Register is FALSE and Notification does not match a known registration function.                        
**/
EFI_STATUS
EFIAPI
RegisterNotify (
  IN BOOLEAN                    Register,
  IN EFI_ACPI_NOTIFICATION_FN   Notification
  );

/**
  Create a handle for the first ACPI opcode in an ACPI system description table.
  
  @param[in]    TableKey    The table key for the ACPI table, as returned by GetTable().
  @param[out]   Handle      On return, points to the newly created ACPI handle.

  @retval EFI_SUCCESS       Handle created successfully.
  @retval EFI_NOT_FOUND     TableKey does not refer to a valid ACPI table.  
**/
EFI_STATUS
EFIAPI
OpenSdt (
  IN    UINTN           TableKey,
  OUT   EFI_ACPI_HANDLE *Handle
  );

/**
  Create a handle from an ACPI opcode
  
  @param[in]  Buffer                 Points to the ACPI opcode.
  @param[out] Handle                 Upon return, holds the handle.
  
  @retval   EFI_SUCCESS             Success
  @retval   EFI_INVALID_PARAMETER   Buffer is NULL or Handle is NULL or Buffer points to an
                                    invalid opcode.
  
**/
EFI_STATUS
EFIAPI
Open (
  IN    VOID            *Buffer,
  OUT   EFI_ACPI_HANDLE *Handle 
  );

/**
  Close an ACPI handle.
  
  @param[in] Handle Returns the handle.
  
  @retval EFI_SUCCESS           Success
  @retval EFI_INVALID_PARAMETER Handle is NULL or does not refer to a valid ACPI object.  
**/
EFI_STATUS
EFIAPI
Close (
  IN EFI_ACPI_HANDLE Handle
  );

/**
  Retrieve information about an ACPI object.
  
  @param[in]    Handle      ACPI object handle.
  @param[in]    Index       Index of the data to retrieve from the object. In general, indexes read from left-to-right
                            in the ACPI encoding, with index 0 always being the ACPI opcode.
  @param[out]   DataType    Points to the returned data type or EFI_ACPI_DATA_TYPE_NONE if no data exists
                            for the specified index.
  @param[out]   Data        Upon return, points to the pointer to the data.
  @param[out]   DataSize    Upon return, points to the size of Data.
  
  @retval       EFI_SUCCESS           Success.
  @retval       EFI_INVALID_PARAMETER Handle is NULL or does not refer to a valid ACPI object.
**/
EFI_STATUS
EFIAPI
GetOption (
  IN        EFI_ACPI_HANDLE     Handle,
  IN        UINTN               Index,
  OUT       EFI_ACPI_DATA_TYPE  *DataType,
  OUT CONST VOID                **Data,
  OUT       UINTN               *DataSize
  );

/**
  Change information about an ACPI object.
  
  @param[in]  Handle    ACPI object handle.
  @param[in]  Index     Index of the data to retrieve from the object. In general, indexes read from left-to-right
                        in the ACPI encoding, with index 0 always being the ACPI opcode.
  @param[in]  Data      Points to the data.
  @param[in]  DataSize  The size of the Data.

  @retval EFI_SUCCESS           Success
  @retval EFI_INVALID_PARAMETER Handle is NULL or does not refer to a valid ACPI object.
  @retval EFI_BAD_BUFFER_SIZE   Data cannot be accommodated in the space occupied by
                                the option.

**/
EFI_STATUS
EFIAPI
SetOption (
  IN        EFI_ACPI_HANDLE Handle,
  IN        UINTN           Index,
  IN CONST  VOID            *Data,
  IN        UINTN           DataSize
  );

/**
  Return the child ACPI objects.
  
  @param[in]        ParentHandle    Parent handle.
  @param[in, out]   Handle          On entry, points to the previously returned handle or NULL to start with the first
                                    handle. On return, points to the next returned ACPI handle or NULL if there are no
                                    child objects.

  @retval EFI_SUCCESS               Success
  @retval EFI_INVALID_PARAMETER     ParentHandle is NULL or does not refer to a valid ACPI object.                                
**/
EFI_STATUS
EFIAPI
GetChild (
  IN EFI_ACPI_HANDLE        ParentHandle,
  IN OUT EFI_ACPI_HANDLE    *Handle
  );

/**
  Returns the handle of the ACPI object representing the specified ACPI path
  
  @param[in]    HandleIn    Points to the handle of the object representing the starting point for the path search.
  @param[in]    AcpiPath    Points to the ACPI path, which conforms to the ACPI encoded path format.
  @param[out]   HandleOut   On return, points to the ACPI object which represents AcpiPath, relative to
                            HandleIn.
                            
  @retval EFI_SUCCESS           Success
  @retval EFI_INVALID_PARAMETER HandleIn is NULL or does not refer to a valid ACPI object.                            
**/
EFI_STATUS
EFIAPI
FindPath (
  IN    EFI_ACPI_HANDLE HandleIn,
  IN    VOID            *AcpiPath,
  OUT   EFI_ACPI_HANDLE *HandleOut
  );

//
// ACPI SDT function
//

/**
  Create a handle from an ACPI opcode
  
  @param[in]  Buffer                 Points to the ACPI opcode.
  @param[in]  BufferSize             Max buffer size.
  @param[out] Handle                 Upon return, holds the handle.
  
  @retval   EFI_SUCCESS             Success
  @retval   EFI_INVALID_PARAMETER   Buffer is NULL or Handle is NULL or Buffer points to an
                                    invalid opcode.
  
**/
EFI_STATUS
SdtOpenEx (
  IN    VOID            *Buffer,
  IN    UINTN           BufferSize,
  OUT   EFI_ACPI_HANDLE *Handle 
  );

//
// AML support function
//

/**
  Get AML NameString size.

  @param[in]    Buffer     AML NameString.
  @param[out]   BufferSize AML NameString size 
  
  @retval       EFI_SUCCESS           Success.
  @retval       EFI_INVALID_PARAMETER Buffer does not refer to a valid AML NameString.
**/
EFI_STATUS
AmlGetNameStringSize (
  IN  UINT8              *Buffer,
  OUT UINTN              *BufferSize
  );

/**
  This function retuns package length from the buffer.

  @param[in]  Buffer    AML buffer
  @param[out] PkgLength The total length of package.

  @return The byte data count to present the package length.
**/
UINTN
AmlGetPkgLength (
  IN UINT8              *Buffer,
  OUT UINTN             *PkgLength
  );

/**
  This function returns AcpiDataType according to AmlType.

  @param[in]  AmlType        AML Type.

  @return AcpiDataType
**/
EFI_ACPI_DATA_TYPE
AmlTypeToAcpiType (
  IN AML_OP_PARSE_FORMAT  AmlType
  );

/**
  This function returns AmlByteEncoding according to OpCode Byte.

  @param[in]  OpByteBuffer        OpCode byte buffer.

  @return AmlByteEncoding
**/
AML_BYTE_ENCODING *
AmlSearchByOpByte (
  IN UINT8                *OpByteBuffer
  );

/**
  Return object size.
  
  @param[in]    AmlByteEncoding      AML Byte Encoding.
  @param[in]    Buffer               AML object buffer.
  @param[in]    MaxBufferSize        AML object buffer MAX size. The parser can not parse any data exceed this region.
  
  @return       Size of the object.
**/
UINTN
AmlGetObjectSize (
  IN AML_BYTE_ENCODING   *AmlByteEncoding,
  IN UINT8               *Buffer,
  IN UINTN               MaxBufferSize
  );

/**
  Return object name.
  
  @param[in]    AmlHandle            AML handle.
  
  @return       Name of the object.
**/
CHAR8 *
AmlGetObjectName (
  IN EFI_AML_HANDLE      *AmlHandle
  );

/**
  Retrieve information according to AmlHandle
  
  @param[in]    AmlHandle            AML handle.
  @param[in]    Index                Index of the data to retrieve from the object. In general, indexes read from left-to-right
                                     in the ACPI encoding, with index 0 always being the ACPI opcode.
  @param[out]   DataType             Points to the returned data type or EFI_ACPI_DATA_TYPE_NONE if no data exists
                                     for the specified index.
  @param[out]   Data                 Upon return, points to the pointer to the data.
  @param[out]   DataSize             Upon return, points to the size of Data.
  
  @retval       EFI_SUCCESS           Success.
  @retval       EFI_INVALID_PARAMETER AmlHandle does not refer to a valid ACPI object.
**/
EFI_STATUS
AmlParseOptionHandleCommon (
  IN EFI_AML_HANDLE      *AmlHandle,
  IN AML_OP_PARSE_INDEX  Index,
  OUT EFI_ACPI_DATA_TYPE *DataType,
  OUT VOID               **Data,
  OUT UINTN              *DataSize
  );

/**
  Return offset of last option.
  
  @param[in]    AmlHandle            AML Handle.
  @param[out]   Buffer               Upon return, points to the offset after last option.
  
  @retval       EFI_SUCCESS           Success.
  @retval       EFI_INVALID_PARAMETER AmlHandle does not refer to a valid ACPI object.
**/
EFI_STATUS
AmlGetOffsetAfterLastOption (
  IN EFI_AML_HANDLE         *AmlHandle,
  OUT UINT8                 **Buffer
  );

/**
  Return the child ACPI objects from Root Handle.
  
  @param[in]        AmlParentHandle Parent handle. It is Root Handle.
  @param[in]        AmlHandle       The previously returned handle or NULL to start with the first handle.
  @param[out]       Buffer          On return, points to the next returned ACPI handle or NULL if there are no
                                    child objects.

  @retval EFI_SUCCESS               Success
  @retval EFI_INVALID_PARAMETER     ParentHandle is NULL or does not refer to a valid ACPI object.                                
**/
EFI_STATUS
AmlGetChildFromRoot (
  IN EFI_AML_HANDLE         *AmlParentHandle,
  IN EFI_AML_HANDLE         *AmlHandle,
  OUT VOID                  **Buffer
  );

/**
  Return the child ACPI objects from Non-Root Handle.
  
  @param[in]        AmlParentHandle Parent handle. It is Non-Root Handle.
  @param[in]        AmlHandle       The previously returned handle or NULL to start with the first handle.
  @param[out]       Buffer          On return, points to the next returned ACPI handle or NULL if there are no
                                    child objects.

  @retval EFI_SUCCESS               Success
  @retval EFI_INVALID_PARAMETER     ParentHandle is NULL or does not refer to a valid ACPI object.                                
**/
EFI_STATUS
AmlGetChildFromNonRoot (
  IN EFI_AML_HANDLE         *AmlParentHandle,
  IN EFI_AML_HANDLE         *AmlHandle,
  OUT VOID                  **Buffer
  );

/**
  Return AML name according to ASL name.
  The caller need free the AmlName returned.

  @param[in]    AslPath     ASL name.

  @return AmlName
**/
UINT8 *
AmlNameFromAslName (
  IN UINT8 *AslPath
  );

/**
  Returns the handle of the ACPI object representing the specified ACPI AML path
  
  @param[in]    AmlHandle   Points to the handle of the object representing the starting point for the path search.
  @param[in]    AmlPath     Points to the ACPI AML path.
  @param[out]   Buffer      On return, points to the ACPI object which represents AcpiPath, relative to
                            HandleIn.
  @param[in]    FromRoot    TRUE means to find AML path from \ (Root) Node.
                            FALSE means to find AML path from this Node (The HandleIn).
                            
  @retval EFI_SUCCESS           Success
  @retval EFI_INVALID_PARAMETER HandleIn does not refer to a valid ACPI object.                            
**/
EFI_STATUS
AmlFindPath (
  IN    EFI_AML_HANDLE  *AmlHandle,
  IN    UINT8           *AmlPath,
  OUT   VOID            **Buffer,
  IN    BOOLEAN         FromRoot
  );

/**
  Print AML NameString.

  @param[in] Buffer AML NameString.
**/
VOID
AmlPrintNameString (
  IN UINT8              *Buffer
  );

/**
  Print AML NameSeg.

  @param[in] Buffer AML NameSeg.
**/
VOID
AmlPrintNameSeg (
  IN UINT8              *Buffer
  );

/**
  Check if it is AML Root name

  @param[in]    Buffer AML path.
  
  @retval       TRUE  AML path is root.
  @retval       FALSE AML path is not root.
**/
BOOLEAN
AmlIsRootPath (
  IN UINT8              *Buffer
  );

#endif