MdeModulePkg/Include/Protocol/VarCheck.h

/** @file
  Variable check definitions.

  Copyright (c) 2015, 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 _VARIABLE_CHECK_H_
#define _VARIABLE_CHECK_H_

#include <Uefi/UefiSpec.h>

typedef struct _EDKII_VAR_CHECK_PROTOCOL    EDKII_VAR_CHECK_PROTOCOL;

#define EDKII_VAR_CHECK_PROTOCOL_GUID { \
  0xaf23b340, 0x97b4, 0x4685, { 0x8d, 0x4f, 0xa3, 0xf2, 0x81, 0x69, 0xb2, 0x1d } \
};

typedef EFI_SET_VARIABLE VAR_CHECK_SET_VARIABLE_CHECK_HANDLER;

/**
  Register SetVariable check handler.
  Variable driver will call the handler to do check before
  really setting the variable into variable storage.

  @param[in] Handler            Pointer to the check handler.

  @retval EFI_SUCCESS           The SetVariable check handler was registered successfully.
  @retval EFI_INVALID_PARAMETER Handler is NULL.
  @retval EFI_ACCESS_DENIED     EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has already been signaled.
  @retval EFI_OUT_OF_RESOURCES  There is not enough resource for the SetVariable check handler register request.
  @retval EFI_UNSUPPORTED       This interface is not implemented.
                                For example, it is unsupported in VarCheck protocol if both VarCheck and SmmVarCheck protocols are present.

**/
typedef
EFI_STATUS
(EFIAPI * EDKII_VAR_CHECK_REGISTER_SET_VARIABLE_CHECK_HANDLER) (
  IN VAR_CHECK_SET_VARIABLE_CHECK_HANDLER   Handler
  );

#define VAR_CHECK_VARIABLE_PROPERTY_REVISION      0x0001
//
// 1. Set by VariableLock PROTOCOL
// 2. Set by VarCheck PROTOCOL
//
// If set, other fields for check will be ignored.
//
#define VAR_CHECK_VARIABLE_PROPERTY_READ_ONLY     BIT0

typedef struct {
  UINT16                            Revision;
  UINT16                            Property;
  UINT32                            Attributes;
  UINTN                             MinSize;
  UINTN                             MaxSize;
} VAR_CHECK_VARIABLE_PROPERTY;

typedef struct {
  EFI_GUID                      *Guid;
  CHAR16                        *Name;
  VAR_CHECK_VARIABLE_PROPERTY   VariableProperty;
} VARIABLE_ENTRY_PROPERTY;

/**
  Variable property set.
  Variable driver will do check according to the VariableProperty before
  really setting the variable into variable storage.

  @param[in] Name               Pointer to the variable name.
  @param[in] Guid               Pointer to the vendor GUID.
  @param[in] VariableProperty   Pointer to the input variable property.

  @retval EFI_SUCCESS           The property of variable specified by the Name and Guid was set successfully.
  @retval EFI_INVALID_PARAMETER Name, Guid or VariableProperty is NULL, or Name is an empty string,
                                or the fields of VariableProperty are not valid.
  @retval EFI_ACCESS_DENIED     EFI_END_OF_DXE_EVENT_GROUP_GUID or EFI_EVENT_GROUP_READY_TO_BOOT has
                                already been signaled.
  @retval EFI_OUT_OF_RESOURCES  There is not enough resource for the variable property set request.

**/
typedef
EFI_STATUS
(EFIAPI * EDKII_VAR_CHECK_VARIABLE_PROPERTY_SET) (
  IN CHAR16                         *Name,
  IN EFI_GUID                       *Guid,
  IN VAR_CHECK_VARIABLE_PROPERTY    *VariableProperty
  );

/**
  Variable property get.

  @param[in]  Name              Pointer to the variable name.
  @param[in]  Guid              Pointer to the vendor GUID.
  @param[out] VariableProperty  Pointer to the output variable property.

  @retval EFI_SUCCESS           The property of variable specified by the Name and Guid was got successfully.
  @retval EFI_INVALID_PARAMETER Name, Guid or VariableProperty is NULL, or Name is an empty string.
  @retval EFI_NOT_FOUND         The property of variable specified by the Name and Guid was not found.

**/
typedef
EFI_STATUS
(EFIAPI * EDKII_VAR_CHECK_VARIABLE_PROPERTY_GET) (
  IN CHAR16                         *Name,
  IN EFI_GUID                       *Guid,
  OUT VAR_CHECK_VARIABLE_PROPERTY   *VariableProperty
  );

struct _EDKII_VAR_CHECK_PROTOCOL {
  EDKII_VAR_CHECK_REGISTER_SET_VARIABLE_CHECK_HANDLER   RegisterSetVariableCheckHandler;
  EDKII_VAR_CHECK_VARIABLE_PROPERTY_SET                 VariablePropertySet;
  EDKII_VAR_CHECK_VARIABLE_PROPERTY_GET                 VariablePropertyGet;
};

extern EFI_GUID gEdkiiVarCheckProtocolGuid;

#endif