IntelFrameworkPkg/Include/Protocol/FrameworkFormCallback.h

   1 /** @file
   2   The EFI_FORM_CALLBACK_PROTOCOL is the defined interface for access to custom
   3   NV storage devices and for communication of user selections in a more
   4   interactive environment.  This protocol should be published by hardware
   5   specific drivers that want to export access to custom hardware storage or
   6   publish IFR that need to call back the original driver.
   7
   8   Copyright (c) 2006 - 2009, Intel Corporation
   9   All rights reserved. This program and the accompanying materials
  10   are licensed and made available under the terms and conditions of the BSD License
  11   which accompanies this distribution.  The full text of the license may be found at
  12   http://opensource.org/licenses/bsd-license.php
  13
  14   THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
  15   WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
  16
  17   @par Revision Reference:
  18   This protocol is defined in HII spec 0.92.
  19
  20 **/
  21
  22 #ifndef __FRAMEWORK_FORM_CALLBACK_H__
  23 #define __FRAMEWORK_FORM_CALLBACK_H__
  24
  25 #include <Protocol/FrameworkHii.h>
  26 #include <Protocol/FrameworkFormBrowser.h>
  27
  28 #define EFI_FORM_CALLBACK_PROTOCOL_GUID \
  29   { \
  30     0xf3e4543d, 0xcf35, 0x6cef, {0x35, 0xc4, 0x4f, 0xe6, 0x34, 0x4d, 0xfc, 0x54 } \
  31   }
  32
  33 //
  34 // Forward reference for pure ANSI compatability
  35 //
  36 typedef struct _EFI_FORM_CALLBACK_PROTOCOL  EFI_FORM_CALLBACK_PROTOCOL;
  37
  38 ///
  39 ///  Inconsistent with specification here:
  40 ///  RESET_REQUIRED, EXIT_REQUIRED, SAVE_REQUIRED, NV_CHANGED and NV_NOT_CHANGED are not
  41 ///  defined in HII specification. These Flags of EFI_IFR_DATA_ENTRY should be defined
  42 ///  to describe the standard behavior of the browser after the callback.
  43 ///
  44 /// If this flag is set, the browser will exit and reset after processing callback results
  45 ///
  46 #define RESET_REQUIRED  1
  47 ///
  48 /// If this flag is set, the browser will exit after processing callback results
  49 ///
  50 #define EXIT_REQUIRED   2
  51 ///
  52 /// If this flag is set, the browser will save the NV data after processing callback results
  53 ///
  54 #define SAVE_REQUIRED   4
  55 ///
  56 /// If this flag is set, the browser will turn the NV flag on after processing callback results
  57 ///
  58 #define NV_CHANGED      8
  59 ///
  60 /// If this flag is set, the browser will turn the NV flag off after processing callback results
  61 ///
  62 #define NV_NOT_CHANGED  16
  63
  64 #pragma pack(1)
  65 typedef struct {
  66   UINT8   OpCode;           ///< Likely a string, numeric, or one-of
  67   UINT8   Length;           ///< Length of the EFI_IFR_DATA_ENTRY packet
  68   UINT16  Flags;            ///< Flags settings to determine what behavior is desired from the browser after the callback
  69   VOID    *Data;            ///< The data in the form based on the op-code type - this is not a pointer to the data, the data follows immediately
  70   ///
  71   /// If the OpCode is a OneOf or Numeric type - Data is a UINT16 value
  72   /// If the OpCode is a String type - Data is a CHAR16[x] type
  73   /// If the OpCode is a Checkbox type - Data is a UINT8 value
  74   /// If the OpCode is a NV Access type - Data is a EFI_IFR_NV_DATA structure
  75   ///
  76 } EFI_IFR_DATA_ENTRY;
  77
  78 typedef struct {
  79   VOID                *NvRamMap;  ///< If the flag of the op-code specified retrieval of a copy of the NVRAM map,
  80   //
  81   // this is a pointer to a buffer copy
  82   //
  83   UINT32              EntryCount; ///< How many EFI_IFR_DATA_ENTRY entries
  84   //
  85   // EFI_IFR_DATA_ENTRY  Data[1];    // The in-line Data entries.
  86   //
  87 } EFI_IFR_DATA_ARRAY;
  88
  89
  90 typedef union {
  91   EFI_IFR_DATA_ARRAY  DataArray;  ///< Primarily used by those who call back to their drivers and use HII as a repository
  92   EFI_IFR_PACKET      DataPacket; ///< Primarily used by those which do not use HII as a repository
  93   CHAR16              String[1];  ///< If returning an error - fill the string with null-terminated contents
  94 } EFI_HII_CALLBACK_PACKET;
  95
  96 typedef struct {
  97   FRAMEWORK_EFI_IFR_OP_HEADER Header;
  98   UINT16            QuestionId;   ///< Offset into the map
  99   UINT8             StorageWidth; ///< Width of the value
 100   //
 101   // CHAR8             Data[1];      // The Data itself
 102   //
 103 } EFI_IFR_NV_DATA;
 104
 105 #pragma pack()
 106 //
 107 // The following types are currently defined:
 108 //
 109 /**
 110   Returns the value of a variable.
 111
 112   @param  This                  A pointer to the EFI_FORM_CALLBACK_PROTOCOL instance.
 113   @param  VariableName          A NULL-terminated Unicode string that is the
 114                                 name of the vendor's variable.
 115   @param  VendorGuid            A unique identifier for the vendor.
 116   @param  Attributes            If not NULL, a pointer to the memory location to
 117                                 return the attribute's bit-mask for the variable.
 118   @param  DataSize              The size in bytes of the Buffer. A size of zero causes
 119                                 the variable to be deleted.
 120   @param  Buffer                The buffer to return the contents of the variable.
 121
 122   @retval EFI_SUCCESS           The function completed successfully.
 123   @retval EFI_NOT_FOUND         The variable was not found.
 124   @retval EFI_BUFFER_TOO_SMALL  The DataSize is too small for the result.
 125                                 DataSize has been updated with the size needed to complete the request.
 126   @retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
 127   @retval EFI_DEVICE_ERROR      The variable could not be saved due to a hardware failure.
 128
 129 **/
 130 typedef
 131 EFI_STATUS
 132 (EFIAPI *EFI_NV_READ)(
 133   IN     EFI_FORM_CALLBACK_PROTOCOL    *This,
 134   IN     CHAR16                        *VariableName,
 135   IN     EFI_GUID                      *VendorGuid,
 136   OUT    UINT32                        *Attributes OPTIONAL,
 137   IN OUT UINTN                         *DataSize,
 138   OUT    VOID                          *Buffer
 139   );
 140
 141 /**
 142   Sets the value of a variable.
 143
 144   @param  This                  A pointer to the EFI_FORM_CALLBACK_PROTOCOL instance.
 145   @param  VariableName          A NULL-terminated Unicode string that is the
 146                                 name of the vendor's variable. Each VariableName is unique for each VendorGuid.
 147   @param  VendorGuid            A unique identifier for the vendor.
 148   @param  Attributes            Attributes bit-mask to set for the variable.
 149                                 Inconsistent with specification here:
 150                                 Attributes data type has been changed from UINT32 * to UINT32,
 151                                 because the input paramter is not necessary to use pointer date type.
 152   @param  DataSize              The size in bytes of the Buffer. A size of zero causes
 153                                 the variable to be deleted.
 154   @param  Buffer                The buffer containing the contents of the variable.
 155   @param  ResetRequired         Returns a value from the driver that abstracts
 156                                 this information and will enable a system to know if a system reset
 157                                 is required to achieve the configuration changes being enabled through
 158                                 this function.
 159
 160   @retval EFI_SUCCESS           The firmware has successfully stored the variable and
 161                                 its data as defined by the Attributes.
 162   @retval EFI_OUT_OF_RESOURCES  Not enough storage is available to hold
 163                                 the variable and its data.
 164   @retval EFI_INVALID_PARAMETER An invalid combination of Attributes bits
 165                                 was supplied, or the DataSize exceeds the maximum allowed.
 166   @retval EFI_DEVICE_ERROR      The variable could not be saved due to a hardware failure.
 167
 168 **/
 169 typedef
 170 EFI_STATUS
 171 (EFIAPI *EFI_NV_WRITE)(
 172   IN     EFI_FORM_CALLBACK_PROTOCOL    *This,
 173   IN     CHAR16                        *VariableName,
 174   IN     EFI_GUID                      *VendorGuid,
 175   IN     UINT32                        Attributes,
 176   IN     UINTN                         DataSize,
 177   IN     VOID                          *Buffer,
 178   OUT    BOOLEAN                       *ResetRequired
 179   );
 180
 181 /**
 182   This function is called to provide results data to the driver.
 183
 184   @param  This                  A pointer to the EFI_FORM_CALLBACK_PROTOCOL instance.
 185   @param  KeyValue              A unique value which is sent to the original exporting
 186                                 driver so that it can identify the type of data to expect. The format of
 187                                 the data tends to vary based on the opcode that generated the callback.
 188   @param  Data                  A pointer to the data being sent to the original exporting driver.
 189   @param  Packet                A pointer to a packet of information which a driver passes
 190                                 back to the browser.
 191
 192   @return Status Code
 193
 194 **/
 195 typedef
 196 EFI_STATUS
 197 (EFIAPI *EFI_FORM_CALLBACK)(
 198   IN     EFI_FORM_CALLBACK_PROTOCOL    *This,
 199   IN     UINT16                        KeyValue,
 200   IN     EFI_IFR_DATA_ARRAY  *Data,
 201   OUT    EFI_HII_CALLBACK_PACKET       **Packet
 202   );
 203
 204 /**
 205   The EFI_FORM_CALLBACK_PROTOCOL is the defined interface for access to
 206   custom NVS devices as well as communication of user selections in a more
 207   interactive environment. This protocol should be published by platform-specific
 208   drivers that want to export access to custom hardware storage or publish IFR
 209   that has a requirement to call back the original driver.
 210 **/
 211 struct _EFI_FORM_CALLBACK_PROTOCOL {
 212   EFI_NV_READ       NvRead;     ///< The read operation to access the NV data serviced by a hardware-specific driver.
 213   EFI_NV_WRITE      NvWrite;    ///< The write operation to access the NV data serviced by a hardware-specific driver.
 214   EFI_FORM_CALLBACK Callback;   ///< The function that is called from the configuration browser to communicate key value pairs.
 215 };
 216
 217 extern EFI_GUID gEfiFormCallbackProtocolGuid;
 218
 219 #endif