DynamicTablesPkg/Include/ConfigurationManagerHelper.h


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/** @file

  Copyright (c) 2017 - 2019, ARM Limited. All rights reserved.

  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.

  @par Glossary:
    - Cm or CM   - Configuration Manager
    - Obj or OBJ - Object
**/

#ifndef CONFIGURATION_MANAGER_HELPER_H_
#define CONFIGURATION_MANAGER_HELPER_H_

/** The GET_OBJECT_LIST macro expands to a function that is used to retrieve
    an object or an object list from the Configuration Manager using the
    Configuration Manager Protocol interface.

  The macro expands to a function which has the following prototype:

  STATIC
  EFI_STATUS
  EFIAPI
  Get<CmObjectId> (
    IN  CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL * CONST CfgMgrProtocol,
    IN  CONST CM_OBJECT_TOKEN                              Token OPTIONAL,
    OUT       Type                                **       List,
    OUT       UINT32                               *       Count OPTIONAL
    );

  Generated function parameters:
  @param [in]  CfgMgrProtocol Pointer to the Configuration Manager protocol
                              interface.
  @param [in]  Token          Reference token for the Object.
  @param [out] List           Pointer to the Object list.
  @param [out] Count          Count of the objects returned in the list.

  Macro Parameters:
  @param [in] CmObjectNameSpace The Object Namespace
  @param [in] CmObjectId        Object Id.
  @param [in] Type              Structure used to describe the Object.

  @retval EFI_SUCCESS           Success.
  @retval EFI_INVALID_PARAMETER A parameter is invalid.
  @retval EFI_NOT_FOUND         The required object information is not found.
  @retval EFI_BAD_BUFFER_SIZE   The size returned by the Configuration
                                Manager is less than the Object size for the
                                requested object.
**/
#define GET_OBJECT_LIST(CmObjectNameSpace, CmObjectId, Type)                  \
STATIC                                                                        \
EFI_STATUS                                                                    \
EFIAPI                                                                        \
Get##CmObjectId (                                                             \
  IN  CONST EDKII_CONFIGURATION_MANAGER_PROTOCOL  * CONST CfgMgrProtocol,     \
  IN  CONST CM_OBJECT_TOKEN                               Token OPTIONAL,     \
  OUT       Type                                 **       List,               \
  OUT       UINT32                                * CONST Count OPTIONAL      \
  )                                                                           \
{                                                                             \
  EFI_STATUS         Status;                                                  \
  CM_OBJ_DESCRIPTOR  CmObjectDesc;                                            \
  UINT32             ObjCount = 0;                                            \
  if (List == NULL) {                                                         \
    Status = EFI_INVALID_PARAMETER;                                           \
    DEBUG ((                                                                  \
      DEBUG_ERROR,                                                            \
      "ERROR: Get" #CmObjectId ": Invalid out parameter for"                  \
      " object list. Status = %r\n",                                          \
      Status                                                                  \
      ));                                                                     \
    goto error_handler;                                                       \
  }                                                                           \
  Status = CfgMgrProtocol->GetObject (                                        \
                             CfgMgrProtocol,                                  \
                             CREATE_CM_OBJECT_ID (                            \
                               CmObjectNameSpace,                             \
                               CmObjectId                                     \
                               ),                                             \
                             Token,                                           \
                             &CmObjectDesc                                    \
                             );                                               \
  if (EFI_ERROR (Status)) {                                                   \
    DEBUG ((                                                                  \
      DEBUG_INFO,                                                             \
      "INFO: Get" #CmObjectId ": Platform does not implement "                \
      #CmObjectId ". Status = %r\n",                                          \
      Status                                                                  \
      ));                                                                     \
    *List = NULL;                                                             \
    goto error_handler;                                                       \
  }                                                                           \
  if (CmObjectDesc.ObjectId !=                                                \
      CREATE_CM_OBJECT_ID (CmObjectNameSpace, CmObjectId)) {                  \
    DEBUG ((                                                                  \
      DEBUG_ERROR,                                                            \
      "ERROR: Get" #CmObjectId ": " #CmObjectId                               \
      ": Invalid ObjectId = 0x%x\n, expected Id = 0x%x\n",                    \
      CmObjectDesc.ObjectId,                                                  \
      CREATE_CM_OBJECT_ID (CmObjectNameSpace, CmObjectId)                     \
      ));                                                                     \
    ASSERT (FALSE);                                                           \
    Status = EFI_INVALID_PARAMETER;                                           \
    goto error_handler;                                                       \
  }                                                                           \
  if (CmObjectDesc.Size < (sizeof (Type) * CmObjectDesc.Count)) {             \
    DEBUG ((                                                                  \
      DEBUG_ERROR,                                                            \
      "ERROR: Get" #CmObjectId ": " #CmObjectId                               \
      ": Buffer too small, size = 0x%x\n",                                    \
      CmObjectDesc.Size                                                       \
      ));                                                                     \
    ASSERT (FALSE);                                                           \
    Status = EFI_BAD_BUFFER_SIZE;                                             \
    goto error_handler;                                                       \
  }                                                                           \
  ObjCount = CmObjectDesc.Count;                                              \
  *List = (Type*)CmObjectDesc.Data;                                           \
error_handler:                                                                \
  if (Count != NULL) {                                                        \
    *Count = ObjCount;                                                        \
  }                                                                           \
  return Status;                                                              \
}

#endif // CONFIGURATION_MANAGER_HELPER_H_