[mirror_edk2.git] / IntelFrameworkPkg / Include / Protocol / FrameworkFirmwareVolumeBlock.h

/** @file\r
  This file provides control over block-oriented firmware devices.\r
\r
  Copyright (c) 2006 - 2008, Intel Corporation                                                         \r
  All rights reserved. This program and the accompanying materials                          \r
  are licensed and made available under the terms and conditions of the BSD License         \r
  which accompanies this distribution.  The full text of the license may be found at        \r
  http://opensource.org/licenses/bsd-license.php                                            \r
\r
  THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,                     \r
  WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.             \r
\r
  @par Revision Reference: \r
  This protocol is defined in framework spec: Firmware Volume Block specification\r
\r
**/\r
\r
#ifndef __FRAMEWORK_FIRMWARE_VOLUME_BLOCK_H__\r
#define __FRAMEWORK_FIRMWARE_VOLUME_BLOCK_H__\r
\r
\r
typedef struct _FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL;\r
///\r
/// type of EFI FVB attribute per Frameowrk spec\r
/// \r
typedef UINT32  EFI_FVB_ATTRIBUTES;\r
\r
/**\r
  The GetAttributes() function retrieves the attributes and\r
  current settings of the block. Status Codes Returned\r
\r
  @param This       Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
\r
  @param Attributes Pointer to EFI_FVB_ATTRIBUTES in which the\r
                    attributes and current settings are\r
                    returned. \r
\r
  @retval EFI_SUCCESS The firmware volume attributes were\r
                      returned.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI * FRAMEWORK_EFI_FVB_GET_ATTRIBUTES)(\r
  IN   FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,\r
  OUT  EFI_FVB_ATTRIBUTES                *Attributes\r
);\r
\r
\r
/**\r
  The SetAttributes() function sets configurable firmware volume\r
  attributes and returns the new settings of the firmware volume.\r
\r
  @param This         Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
\r
  @param Attributes   On input, Attributes is a pointer to\r
                      EFI_FVB_ATTRIBUTES that contains the\r
                      desired firmware volume settings. On\r
                      successful return, it contains the new\r
                      settings of the firmware volume. \r
  \r
  @retval EFI_SUCCESS           The firmware volume attributes were returned.\r
\r
  @retval EFI_INVALID_PARAMETER The attributes requested are in\r
                                conflict with the capabilities\r
                                as declared in the firmware\r
                                volume header.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI * FRAMEWORK_EFI_FVB_SET_ATTRIBUTES)(\r
  IN      FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,\r
  IN OUT  EFI_FVB_ATTRIBUTES                *Attributes\r
);\r
\r
\r
/**\r
  The GetPhysicalAddress() function retrieves the base address of\r
  a memory-mapped firmware volume. This function should be called\r
  only for memory-mapped firmware volumes.\r
\r
  @param This     Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
  \r
  @param Address  Pointer to a caller-allocated\r
                  EFI_PHYSICAL_ADDRESS that, on successful\r
                  return from GetPhysicalAddress(), contains the\r
                  base address of the firmware volume.\r
  \r
  @retval EFI_SUCCESS       The firmware volume base address is returned.\r
  \r
  @retval EFI_NOT_SUPPORTED The firmware volume is not memory mapped.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI * FRAMEWORK_EFI_FVB_GET_PHYSICAL_ADDRESS)(\r
  IN    FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,\r
  OUT   EFI_PHYSICAL_ADDRESS                *Address\r
);\r
\r
/**\r
  The GetBlockSize() function retrieves the size of the requested\r
  block. It also returns the number of additional blocks with\r
  the identical size. The GetBlockSize() function is used to\r
  retrieve the block map (see EFI_FIRMWARE_VOLUME_HEADER).\r
\r
\r
  @param This           Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
\r
  @param Lba            Indicates the block for which to return the size.\r
\r
  @param BlockSize      Pointer to a caller-allocated UINTN in which\r
                        the size of the block is returned.\r
\r
  @param NumberOfBlocks Pointer to a caller-allocated UINTN in\r
                        which the number of consecutive blocks,\r
                        starting with Lba, is returned. All\r
                        blocks in this range have a size of\r
                        BlockSize.\r
\r
  \r
  @retval EFI_SUCCESS             The firmware volume base address is returned.\r
  \r
  @retval EFI_INVALID_PARAMETER   The requested LBA is out of range.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI * FRAMEWORK_EFI_FVB_GET_BLOCK_SIZE)(\r
  IN  FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,\r
  IN  EFI_LBA                             Lba,\r
  OUT UINTN                               *BlockSize,\r
  OUT UINTN                               *NumberOfBlocks\r
);\r
\r
\r
/**\r
  Reads the specified number of bytes into a buffer from the specified block.\r
\r
  The Read() function reads the requested number of bytes from the\r
  requested block and stores them in the provided buffer.\r
  Implementations should be mindful that the firmware volume\r
  might be in the ReadDisabled state. If it is in this state,\r
  the Read() function must return the status code\r
  EFI_ACCESS_DENIED without modifying the contents of the\r
  buffer. The Read() function must also prevent spanning block\r
  boundaries. If a read is requested that would span a block\r
  boundary, the read must read up to the boundary but not\r
  beyond. The output parameter NumBytes must be set to correctly\r
  indicate the number of bytes actually read. The caller must be\r
  aware that a read may be partially completed.\r
\r
  @param This     Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
  \r
  @param Lba      The starting logical block index\r
                  from which to read.\r
\r
  @param Offset   Offset into the block at which to begin reading.\r
\r
  @param NumBytes Pointer to a UINTN. At entry, *NumBytes\r
                  contains the total size of the buffer. At\r
                  exit, *NumBytes contains the total number of\r
                  bytes read.\r
\r
  @param Buffer   Pointer to a caller-allocated buffer that will\r
                  be used to hold the data that is read.\r
\r
  @retval EFI_SUCCESS         The firmware volume was read successfully\r
                              and contents are in Buffer.\r
  \r
  @retval EFI_BAD_BUFFER_SIZE Read attempted across an LBA\r
                              boundary. On output, NumBytes\r
                              contains the total number of bytes\r
                              returned in Buffer.\r
  \r
  @retval EFI_ACCESS_DENIED   The firmware volume is in the\r
                              ReadDisabled state.\r
  \r
  @retval EFI_DEVICE_ERROR    The block device is not\r
                              functioning correctly and could\r
                              not be read.\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI *FRAMEWORK_EFI_FVB_READ)(\r
  IN       FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,\r
  IN       EFI_LBA                             Lba,\r
  IN       UINTN                               Offset,\r
  IN OUT   UINTN                               *NumBytes,\r
  IN OUT   UINT8                               *Buffer\r
);\r
\r
/**\r
  Writes the specified number of bytes from the input buffer to the block.\r
\r
  The Write() function writes the specified number of bytes from\r
  the provided buffer to the specified block and offset. If the\r
  firmware volume is sticky write, the caller must ensure that\r
  all the bits of the specified range to write are in the\r
  EFI_FVB_ERASE_POLARITY state before calling the Write()\r
  function, or else the result will be unpredictable. This\r
  unpredictability arises because, for a sticky-write firmware\r
  volume, a write may negate a bit in the EFI_FVB_ERASE_POLARITY\r
  state but cannot flip it back again. In general, before\r
  calling the Write() function, the caller should call the\r
  EraseBlocks() function first to erase the specified block to\r
  write. A block erase cycle will transition bits from the\r
  (NOT)EFI_FVB_ERASE_POLARITY state back to the\r
  EFI_FVB_ERASE_POLARITY state. Implementations should be\r
  mindful that the firmware volume might be in the WriteDisabled\r
  state. If it is in this state, the Write() function must\r
  return the status code EFI_ACCESS_DENIED without modifying the\r
  contents of the firmware volume. The Write() function must\r
  also prevent spanning block boundaries. If a write is\r
  requested that spans a block boundary, the write must store up\r
  to the boundary but not beyond. The output parameter NumBytes\r
  must be set to correctly indicate the number of bytes actually\r
  written. The caller must be aware that a write may be\r
  partially completed. All writes, partial or otherwise, must be\r
  fully flushed to the hardware before the Write() service\r
  returns.\r
\r
  @param This     Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
  \r
  @param Lba      The starting logical block index to write to.\r
  \r
  @param Offset   Offset into the block at which to begin writing.\r
  \r
  @param NumBytes Pointer to a UINTN. At entry, *NumBytes\r
                  contains the total size of the buffer. At\r
                  exit, *NumBytes contains the total number of\r
                  bytes actually written.\r
  \r
  @param Buffer   Pointer to a caller-allocated buffer that\r
                  contains the source for the write.\r
  \r
  @retval EFI_SUCCESS         The firmware volume was written successfully.\r
  \r
  @retval EFI_BAD_BUFFER_SIZE The write was attempted across an\r
                              LBA boundary. On output, NumBytes\r
                              contains the total number of bytes\r
                              actually written.\r
  \r
  @retval EFI_ACCESS_DENIED   The firmware volume is in the\r
                              WriteDisabled state.\r
  \r
  @retval EFI_DEVICE_ERROR    The block device is malfunctioning\r
                              and could not be written.\r
\r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI * FRAMEWORK_EFI_FVB_WRITE)(\r
  IN       FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,\r
  IN       EFI_LBA                             Lba,\r
  IN       UINTN                               Offset,\r
  IN OUT   UINTN                               *NumBytes,\r
  IN       UINT8                               *Buffer\r
);\r
\r
\r
\r
\r
///\r
/// EFI_LBA_LIST_TERMINATOR\r
///\r
#define FRAMEWORK_EFI_LBA_LIST_TERMINATOR   0xFFFFFFFFFFFFFFFFULL\r
\r
\r
/**\r
  Erases and initializes a firmware volume block.\r
\r
  The EraseBlocks() function erases one or more blocks as denoted\r
  by the variable argument list. The entire parameter list of\r
  blocks must be verified before erasing any blocks. If a block is\r
  requested that does not exist within the associated firmware\r
  volume (it has a larger index than the last block of the\r
  firmware volume), the EraseBlocks() function must return the\r
  status code EFI_INVALID_PARAMETER without modifying the contents\r
  of the firmware volume. Implementations should be mindful that\r
  the firmware volume might be in the WriteDisabled state. If it\r
  is in this state, the EraseBlocks() function must return the\r
  status code EFI_ACCESS_DENIED without modifying the contents of\r
  the firmware volume. All calls to EraseBlocks() must be fully\r
  flushed to the hardware before the EraseBlocks() service\r
  returns.\r
\r
  @param This   Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL\r
                instance.\r
\r
  @param ...    The variable argument list is a list of tuples.\r
                Each tuple describes a range of LBAs to erase\r
                and consists of the following:\r
                - An EFI_LBA that indicates the starting LBA\r
                - A UINTN that indicates the number of blocks to\r
                  erase\r
\r
                The list is terminated with an\r
                EFI_LBA_LIST_TERMINATOR. For example, the\r
                following indicates that two ranges of blocks\r
                (5-7 and 10-11) are to be erased: EraseBlocks\r
                (This, 5, 3, 10, 2, EFI_LBA_LIST_TERMINATOR);\r
\r
  @retval EFI_SUCCESS The erase request was successfully\r
                      completed.\r
  \r
  @retval EFI_ACCESS_DENIED   The firmware volume is in the\r
                              WriteDisabled state.\r
  @retval EFI_DEVICE_ERROR  The block device is not functioning\r
                            correctly and could not be written.\r
                            The firmware device may have been\r
                            partially erased.\r
  @retval EFI_INVALID_PARAMETER One or more of the LBAs listed\r
                                in the variable argument list do\r
                                not exist in the firmware volume.  \r
\r
**/\r
typedef\r
EFI_STATUS\r
(EFIAPI * FRAMEWORK_EFI_FVB_ERASE_BLOCKS)(\r
  IN   FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL  *This,\r
  ...\r
);\r
\r
///\r
/// The Firmware Volume Block Protocol is the low-level interface\r
/// to a firmware volume. File-level access to a firmware volume\r
/// should not be done using the Firmware Volume Block Protocol.\r
/// Normal access to a firmware volume must use the Firmware\r
/// Volume Protocol. Typically, only the file system driver that\r
/// produces the Firmware Volume Protocol will bind to the\r
/// Firmware Volume Block Protocol.\r
///\r
struct _FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL {\r
  FRAMEWORK_EFI_FVB_GET_ATTRIBUTES        GetAttributes;\r
  FRAMEWORK_EFI_FVB_SET_ATTRIBUTES        SetAttributes;\r
  FRAMEWORK_EFI_FVB_GET_PHYSICAL_ADDRESS  GetPhysicalAddress;\r
  FRAMEWORK_EFI_FVB_GET_BLOCK_SIZE        GetBlockSize;\r
  FRAMEWORK_EFI_FVB_READ                  Read;\r
  FRAMEWORK_EFI_FVB_WRITE                 Write;\r
  FRAMEWORK_EFI_FVB_ERASE_BLOCKS          EraseBlocks;\r
  ///\r
  /// Handle of the parent firmware volume.\r
  ///  \r
  EFI_HANDLE                    ParentHandle;\r
};\r
\r
\r
\r
#endif\r
Commit	Line	Data
220c61c1	1	/** @file\r
	2	This file provides control over block-oriented firmware devices.\r
	3	\r
	4	Copyright (c) 2006 - 2008, Intel Corporation \r
	5	All rights reserved. This program and the accompanying materials \r
	6	are licensed and made available under the terms and conditions of the BSD License \r
	7	which accompanies this distribution. The full text of the license may be found at \r
	8	http://opensource.org/licenses/bsd-license.php \r
	9	\r
	10	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, \r
	11	WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED. \r
	12	\r
	13	@par Revision Reference: \r
	14	This protocol is defined in framework spec: Firmware Volume Block specification\r
	15	\r
	16	**/\r
	17	\r
	18	#ifndef __FRAMEWORK_FIRMWARE_VOLUME_BLOCK_H__\r
	19	#define __FRAMEWORK_FIRMWARE_VOLUME_BLOCK_H__\r
	20	\r
220c61c1	21	\r
	22	typedef struct _FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL;\r
	23	///\r
	24	/// type of EFI FVB attribute per Frameowrk spec\r
	25	/// \r
	26	typedef UINT32 EFI_FVB_ATTRIBUTES;\r
	27	\r
	28	/**\r
	29	The GetAttributes() function retrieves the attributes and\r
	30	current settings of the block. Status Codes Returned\r
	31	\r
	32	@param This Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
	33	\r
	34	@param Attributes Pointer to EFI_FVB_ATTRIBUTES in which the\r
	35	attributes and current settings are\r
	36	returned. \r
	37	\r
	38	@retval EFI_SUCCESS The firmware volume attributes were\r
	39	returned.\r
	40	\r
	41	**/\r
	42	typedef\r
	43	EFI_STATUS\r
	44	(EFIAPI * FRAMEWORK_EFI_FVB_GET_ATTRIBUTES)(\r
	45	IN FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,\r
	46	OUT EFI_FVB_ATTRIBUTES *Attributes\r
	47	);\r
	48	\r
	49	\r
	50	/**\r
	51	The SetAttributes() function sets configurable firmware volume\r
	52	attributes and returns the new settings of the firmware volume.\r
	53	\r
	54	@param This Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
	55	\r
	56	@param Attributes On input, Attributes is a pointer to\r
	57	EFI_FVB_ATTRIBUTES that contains the\r
	58	desired firmware volume settings. On\r
	59	successful return, it contains the new\r
	60	settings of the firmware volume. \r
	61	\r
	62	@retval EFI_SUCCESS The firmware volume attributes were returned.\r
	63	\r
	64	@retval EFI_INVALID_PARAMETER The attributes requested are in\r
	65	conflict with the capabilities\r
	66	as declared in the firmware\r
	67	volume header.\r
	68	\r
	69	**/\r
	70	typedef\r
	71	EFI_STATUS\r
	72	(EFIAPI * FRAMEWORK_EFI_FVB_SET_ATTRIBUTES)(\r
	73	IN FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,\r
	74	IN OUT EFI_FVB_ATTRIBUTES *Attributes\r
	75	);\r
	76	\r
	77	\r
	78	/**\r
	79	The GetPhysicalAddress() function retrieves the base address of\r
	80	a memory-mapped firmware volume. This function should be called\r
	81	only for memory-mapped firmware volumes.\r
	82	\r
	83	@param This Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
	84	\r
85	@param Address Pointer to a caller-allocated\r
86	EFI_PHYSICAL_ADDRESS that, on successful\r
87	return from GetPhysicalAddress(), contains the\r
88	base address of the firmware volume.\r
89	\r
90	@retval EFI_SUCCESS The firmware volume base address is returned.\r
91	\r
92	@retval EFI_NOT_SUPPORTED The firmware volume is not memory mapped.\r
93	\r
94	**/\r
95	typedef\r
96	EFI_STATUS\r
97	(EFIAPI * FRAMEWORK_EFI_FVB_GET_PHYSICAL_ADDRESS)(\r
98	IN FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,\r
99	OUT EFI_PHYSICAL_ADDRESS *Address\r
100	);\r
101	\r
102	/**\r
103	The GetBlockSize() function retrieves the size of the requested\r
104	block. It also returns the number of additional blocks with\r
105	the identical size. The GetBlockSize() function is used to\r
106	retrieve the block map (see EFI_FIRMWARE_VOLUME_HEADER).\r
107	\r
108	\r
109	@param This Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
110	\r
111	@param Lba Indicates the block for which to return the size.\r
112	\r
113	@param BlockSize Pointer to a caller-allocated UINTN in which\r
114	the size of the block is returned.\r
115	\r
116	@param NumberOfBlocks Pointer to a caller-allocated UINTN in\r
117	which the number of consecutive blocks,\r
118	starting with Lba, is returned. All\r
119	blocks in this range have a size of\r
120	BlockSize.\r
121	\r
122	\r
123	@retval EFI_SUCCESS The firmware volume base address is returned.\r
124	\r
125	@retval EFI_INVALID_PARAMETER The requested LBA is out of range.\r
126	\r
127	**/\r
128	typedef\r
129	EFI_STATUS\r
130	(EFIAPI * FRAMEWORK_EFI_FVB_GET_BLOCK_SIZE)(\r
131	IN FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,\r
132	IN EFI_LBA Lba,\r
133	OUT UINTN *BlockSize,\r
134	OUT UINTN *NumberOfBlocks\r
135	);\r
136	\r
137	\r
138	/**\r
139	Reads the specified number of bytes into a buffer from the specified block.\r
140	\r
141	The Read() function reads the requested number of bytes from the\r
142	requested block and stores them in the provided buffer.\r
143	Implementations should be mindful that the firmware volume\r
144	might be in the ReadDisabled state. If it is in this state,\r
145	the Read() function must return the status code\r
146	EFI_ACCESS_DENIED without modifying the contents of the\r
147	buffer. The Read() function must also prevent spanning block\r
148	boundaries. If a read is requested that would span a block\r
149	boundary, the read must read up to the boundary but not\r
150	beyond. The output parameter NumBytes must be set to correctly\r
151	indicate the number of bytes actually read. The caller must be\r
152	aware that a read may be partially completed.\r
153	\r
154	@param This Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
155	\r
156	@param Lba The starting logical block index\r
157	from which to read.\r
158	\r
159	@param Offset Offset into the block at which to begin reading.\r
160	\r
161	@param NumBytes Pointer to a UINTN. At entry, *NumBytes\r
162	contains the total size of the buffer. At\r
163	exit, *NumBytes contains the total number of\r
164	bytes read.\r
165	\r
166	@param Buffer Pointer to a caller-allocated buffer that will\r
167	be used to hold the data that is read.\r
168	\r
169	@retval EFI_SUCCESS The firmware volume was read successfully\r
170	and contents are in Buffer.\r
171	\r
172	@retval EFI_BAD_BUFFER_SIZE Read attempted across an LBA\r
173	boundary. On output, NumBytes\r
174	contains the total number of bytes\r
175	returned in Buffer.\r
176	\r
177	@retval EFI_ACCESS_DENIED The firmware volume is in the\r
178	ReadDisabled state.\r
179	\r
180	@retval EFI_DEVICE_ERROR The block device is not\r
181	functioning correctly and could\r
182	not be read.\r
183	\r
184	**/\r
185	typedef\r
186	EFI_STATUS\r
187	(EFIAPI *FRAMEWORK_EFI_FVB_READ)(\r
188	IN FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,\r
189	IN EFI_LBA Lba,\r
190	IN UINTN Offset,\r
191	IN OUT UINTN *NumBytes,\r
192	IN OUT UINT8 *Buffer\r
193	);\r
194	\r
195	/**\r
196	Writes the specified number of bytes from the input buffer to the block.\r
197	\r
198	The Write() function writes the specified number of bytes from\r
199	the provided buffer to the specified block and offset. If the\r
200	firmware volume is sticky write, the caller must ensure that\r
201	all the bits of the specified range to write are in the\r
202	EFI_FVB_ERASE_POLARITY state before calling the Write()\r
203	function, or else the result will be unpredictable. This\r
204	unpredictability arises because, for a sticky-write firmware\r
205	volume, a write may negate a bit in the EFI_FVB_ERASE_POLARITY\r
206	state but cannot flip it back again. In general, before\r
207	calling the Write() function, the caller should call the\r
208	EraseBlocks() function first to erase the specified block to\r
209	write. A block erase cycle will transition bits from the\r
210	(NOT)EFI_FVB_ERASE_POLARITY state back to the\r
211	EFI_FVB_ERASE_POLARITY state. Implementations should be\r
212	mindful that the firmware volume might be in the WriteDisabled\r
213	state. If it is in this state, the Write() function must\r
214	return the status code EFI_ACCESS_DENIED without modifying the\r
215	contents of the firmware volume. The Write() function must\r
216	also prevent spanning block boundaries. If a write is\r
217	requested that spans a block boundary, the write must store up\r
218	to the boundary but not beyond. The output parameter NumBytes\r
219	must be set to correctly indicate the number of bytes actually\r
220	written. The caller must be aware that a write may be\r
221	partially completed. All writes, partial or otherwise, must be\r
222	fully flushed to the hardware before the Write() service\r
223	returns.\r
224	\r
225	@param This Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL instance.\r
226	\r
227	@param Lba The starting logical block index to write to.\r
228	\r
229	@param Offset Offset into the block at which to begin writing.\r
230	\r
231	@param NumBytes Pointer to a UINTN. At entry, *NumBytes\r
232	contains the total size of the buffer. At\r
233	exit, *NumBytes contains the total number of\r
234	bytes actually written.\r
235	\r
236	@param Buffer Pointer to a caller-allocated buffer that\r
237	contains the source for the write.\r
238	\r
239	@retval EFI_SUCCESS The firmware volume was written successfully.\r
240	\r
241	@retval EFI_BAD_BUFFER_SIZE The write was attempted across an\r
242	LBA boundary. On output, NumBytes\r
243	contains the total number of bytes\r
244	actually written.\r
245	\r
246	@retval EFI_ACCESS_DENIED The firmware volume is in the\r
247	WriteDisabled state.\r
248	\r
249	@retval EFI_DEVICE_ERROR The block device is malfunctioning\r
250	and could not be written.\r
251	\r
252	\r
253	**/\r
254	typedef\r
255	EFI_STATUS\r
256	(EFIAPI * FRAMEWORK_EFI_FVB_WRITE)(\r
257	IN FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,\r
258	IN EFI_LBA Lba,\r
259	IN UINTN Offset,\r
260	IN OUT UINTN *NumBytes,\r
261	IN UINT8 *Buffer\r
262	);\r
263	\r
264	\r
265	\r
266	\r
267	///\r
268	/// EFI_LBA_LIST_TERMINATOR\r
269	///\r
270	#define FRAMEWORK_EFI_LBA_LIST_TERMINATOR 0xFFFFFFFFFFFFFFFFULL\r
271	\r
272	\r
273	/**\r
274	Erases and initializes a firmware volume block.\r
275	\r
276	The EraseBlocks() function erases one or more blocks as denoted\r
277	by the variable argument list. The entire parameter list of\r
278	blocks must be verified before erasing any blocks. If a block is\r
279	requested that does not exist within the associated firmware\r
280	volume (it has a larger index than the last block of the\r
281	firmware volume), the EraseBlocks() function must return the\r
282	status code EFI_INVALID_PARAMETER without modifying the contents\r
283	of the firmware volume. Implementations should be mindful that\r
284	the firmware volume might be in the WriteDisabled state. If it\r
285	is in this state, the EraseBlocks() function must return the\r
286	status code EFI_ACCESS_DENIED without modifying the contents of\r
287	the firmware volume. All calls to EraseBlocks() must be fully\r
288	flushed to the hardware before the EraseBlocks() service\r
289	returns.\r
290	\r
291	@param This Indicates the FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL\r
292	instance.\r
293	\r
294	@param ... The variable argument list is a list of tuples.\r
295	Each tuple describes a range of LBAs to erase\r
296	and consists of the following:\r
297	- An EFI_LBA that indicates the starting LBA\r
298	- A UINTN that indicates the number of blocks to\r
299	erase\r
300	\r
301	The list is terminated with an\r
302	EFI_LBA_LIST_TERMINATOR. For example, the\r
303	following indicates that two ranges of blocks\r
304	(5-7 and 10-11) are to be erased: EraseBlocks\r
305	(This, 5, 3, 10, 2, EFI_LBA_LIST_TERMINATOR);\r
306	\r
307	@retval EFI_SUCCESS The erase request was successfully\r
308	completed.\r
309	\r
310	@retval EFI_ACCESS_DENIED The firmware volume is in the\r
311	WriteDisabled state.\r
312	@retval EFI_DEVICE_ERROR The block device is not functioning\r
313	correctly and could not be written.\r
314	The firmware device may have been\r
315	partially erased.\r
316	@retval EFI_INVALID_PARAMETER One or more of the LBAs listed\r
317	in the variable argument list do\r
318	not exist in the firmware volume. \r
319	\r
320	**/\r
321	typedef\r
322	EFI_STATUS\r
323	(EFIAPI * FRAMEWORK_EFI_FVB_ERASE_BLOCKS)(\r
324	IN FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL *This,\r
325	...\r
326	);\r
327	\r
328	///\r
329	/// The Firmware Volume Block Protocol is the low-level interface\r
330	/// to a firmware volume. File-level access to a firmware volume\r
331	/// should not be done using the Firmware Volume Block Protocol.\r
332	/// Normal access to a firmware volume must use the Firmware\r
333	/// Volume Protocol. Typically, only the file system driver that\r
334	/// produces the Firmware Volume Protocol will bind to the\r
335	/// Firmware Volume Block Protocol.\r
336	///\r
337	struct _FRAMEWORK_EFI_FIRMWARE_VOLUME_BLOCK_PROTOCOL {\r
338	FRAMEWORK_EFI_FVB_GET_ATTRIBUTES GetAttributes;\r
339	FRAMEWORK_EFI_FVB_SET_ATTRIBUTES SetAttributes;\r
340	FRAMEWORK_EFI_FVB_GET_PHYSICAL_ADDRESS GetPhysicalAddress;\r
341	FRAMEWORK_EFI_FVB_GET_BLOCK_SIZE GetBlockSize;\r
342	FRAMEWORK_EFI_FVB_READ Read;\r
343	FRAMEWORK_EFI_FVB_WRITE Write;\r
344	FRAMEWORK_EFI_FVB_ERASE_BLOCKS EraseBlocks;\r
345	///\r
346	/// Handle of the parent firmware volume.\r
347	/// \r
348	EFI_HANDLE ParentHandle;\r
349	};\r
350	\r
351	\r
352	\r
353	#endif\r