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/** @file
The EFI_FORM_CALLBACK_PROTOCOL is the defined interface for access to custom
NV storage devices and for communication of user selections in a more
interactive environment. This protocol should be published by hardware
specific drivers that want to export access to custom hardware storage or
publish IFR that need to call back the original driver.
Copyright (c) 2006 - 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 that 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 Revision Reference:
This protocol is defined in HII spec 0.92.
**/
#ifndef __FRAMEWORK_FORM_CALLBACK_H__
#define __FRAMEWORK_FORM_CALLBACK_H__
#include <Protocol/FrameworkHii.h>
#include <Protocol/FrameworkFormBrowser.h>
#define EFI_FORM_CALLBACK_PROTOCOL_GUID \
{ \
0xf3e4543d, 0xcf35, 0x6cef, {0x35, 0xc4, 0x4f, 0xe6, 0x34, 0x4d, 0xfc, 0x54 } \
}
//
// Forward reference for pure ANSI compatability
//
typedef struct _EFI_FORM_CALLBACK_PROTOCOL EFI_FORM_CALLBACK_PROTOCOL;
///
/// Inconsistent with specification here:
/// RESET_REQUIRED, EXIT_REQUIRED, SAVE_REQUIRED, NV_CHANGED and NV_NOT_CHANGED are not
/// defined in HII specification. These Flags of EFI_IFR_DATA_ENTRY should be defined
/// to describe the standard behavior of the browser after the callback.
///
/// If this flag is set, the browser will exit and reset after processing callback results.
///
#define RESET_REQUIRED 1
///
/// If this flag is set, the browser will exit after processing callback results.
///
#define EXIT_REQUIRED 2
///
/// If this flag is set, the browser will save the NV data after processing callback results.
///
#define SAVE_REQUIRED 4
///
/// If this flag is set, the browser will turn the NV flag on after processing callback results.
///
#define NV_CHANGED 8
///
/// If this flag is set, the browser will turn the NV flag off after processing callback results.
///
#define NV_NOT_CHANGED 16
#pragma pack(1)
typedef struct {
UINT8 OpCode; ///< Likely a string, numeric, or one-of
UINT8 Length; ///< Length of the EFI_IFR_DATA_ENTRY packet.
UINT16 Flags; ///< Flags settings to determine what behavior is desired from the browser after the callback.
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.
///
/// If the OpCode is a OneOf or Numeric type - Data is a UINT16 value.
/// If the OpCode is a String type - Data is a CHAR16[x] type.
/// If the OpCode is a Checkbox type - Data is a UINT8 value.
/// If the OpCode is a NV Access type - Data is a EFI_IFR_NV_DATA structure.
///
} EFI_IFR_DATA_ENTRY;
typedef struct {
VOID *NvRamMap; ///< If the flag of the op-code specified retrieval of a copy of the NVRAM map.
//
// this is a pointer to a buffer copy
//
UINT32 EntryCount; ///< Number of EFI_IFR_DATA_ENTRY entries.
//
// EFI_IFR_DATA_ENTRY Data[1]; // The in-line Data entries.
//
} EFI_IFR_DATA_ARRAY;
typedef union {
EFI_IFR_DATA_ARRAY DataArray; ///< Primarily used by those that call back to their drivers and use HII as a repository.
EFI_IFR_PACKET DataPacket; ///< Primarily used by those that do not use HII as a repository.
CHAR16 String[1]; ///< If returning an error - fill the string with null-terminated contents.
} EFI_HII_CALLBACK_PACKET;
typedef struct {
FRAMEWORK_EFI_IFR_OP_HEADER Header;
UINT16 QuestionId; ///< Offset into the map.
UINT8 StorageWidth; ///< Width of the value.
//
// CHAR8 Data[1]; // The Data itself
//
} EFI_IFR_NV_DATA;
#pragma pack()
//
// The following types are currently defined:
//
/**
Returns the value of a variable.
@param This A pointer to the EFI_FORM_CALLBACK_PROTOCOL instance.
@param VariableName A NULL-terminated Unicode string that is the
name of the vendor's variable.
@param VendorGuid A unique identifier for the vendor.
@param Attributes If not NULL, a pointer to the memory location to
return the attribute's bit-mask for the variable.
@param DataSize The size in bytes of the Buffer. A size of zero causes
the variable to be deleted.
@param Buffer The buffer to return the contents of the variable.
@retval EFI_SUCCESS The function completed successfully.
@retval EFI_NOT_FOUND The variable was not found.
@retval EFI_BUFFER_TOO_SMALL The DataSize is too small for the result.
DataSize has been updated with the size needed to complete the request.
@retval EFI_INVALID_PARAMETER One of the parameters has an invalid value.
@retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_NV_READ)(
IN EFI_FORM_CALLBACK_PROTOCOL *This,
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
OUT UINT32 *Attributes OPTIONAL,
IN OUT UINTN *DataSize,
OUT VOID *Buffer
);
/**
Sets the value of a variable.
@param This A pointer to the EFI_FORM_CALLBACK_PROTOCOL instance.
@param VariableName A NULL-terminated Unicode string that is the
name of the vendor's variable. Each VariableName
is unique for each VendorGuid.
@param VendorGuid A unique identifier for the vendor.
@param Attributes Attributes bit-mask to set for the variable.
Inconsistent with specification here:
Attributes data type has been changed from
UINT32 * to UINT32, because the input paramter is
not necessary to use a pointer date type.
@param DataSize The size in bytes of the Buffer. A size of zero causes
the variable to be deleted.
@param Buffer The buffer containing the contents of the variable.
@param ResetRequired Returns a value from the driver that abstracts this
information and will enable a system to know if a
system reset is required to achieve the configuration
changes being enabled through this function.
@retval EFI_SUCCESS The firmware has successfully stored the variable and
its data as defined by the Attributes.
@retval EFI_OUT_OF_RESOURCES Not enough storage is available to hold
the variable and its data.
@retval EFI_INVALID_PARAMETER An invalid combination of Attributes bits
was supplied, or the DataSize exceeds the maximum allowed.
@retval EFI_DEVICE_ERROR The variable could not be saved due to a hardware failure.
**/
typedef
EFI_STATUS
(EFIAPI *EFI_NV_WRITE)(
IN EFI_FORM_CALLBACK_PROTOCOL *This,
IN CHAR16 *VariableName,
IN EFI_GUID *VendorGuid,
IN UINT32 Attributes,
IN UINTN DataSize,
IN VOID *Buffer,
OUT BOOLEAN *ResetRequired
);
/**
This function is called to provide results data to the driver.
@param This A pointer to the EFI_FORM_CALLBACK_PROTOCOL instance.
@param KeyValue A unique value which is sent to the original exporting
driver so that it can identify the type of data
to expect. The format of the data tends to vary based
on the opcode that generated the callback.
@param Data A pointer to the data being sent to the original exporting driver.
@param Packet A pointer to a packet of information that a driver passes
back to the browser.
@return Status Code
**/
typedef
EFI_STATUS
(EFIAPI *EFI_FORM_CALLBACK)(
IN EFI_FORM_CALLBACK_PROTOCOL *This,
IN UINT16 KeyValue,
IN EFI_IFR_DATA_ARRAY *Data,
OUT EFI_HII_CALLBACK_PACKET **Packet
);
/**
The EFI_FORM_CALLBACK_PROTOCOL is the defined interface for access to
custom NVS devices as well as communication of user selections in a more
interactive environment. This protocol should be published by platform-specific
drivers that want to export access to custom hardware storage or publish IFR
that has a requirement to call back the original driver.
**/
struct _EFI_FORM_CALLBACK_PROTOCOL {
EFI_NV_READ NvRead; ///< The read operation to access the NV data serviced by a hardware-specific driver.
EFI_NV_WRITE NvWrite; ///< The write operation to access the NV data serviced by a hardware-specific driver.
EFI_FORM_CALLBACK Callback; ///< The function that is called from the configuration browser to communicate key value pairs.
};
extern EFI_GUID gEfiFormCallbackProtocolGuid;
#endif
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