[mirror_edk2.git] / OvmfPkg / Include / Library / VirtioLib.h

/** @file\r
\r
  Declarations of utility functions used by virtio device drivers.\r
\r
  Copyright (C) 2012-2016, Red Hat, Inc.\r
  Copyright (C) 2017, AMD Inc, All rights reserved.<BR>\r
\r
  SPDX-License-Identifier: BSD-2-Clause-Patent\r
\r
**/\r
\r
#ifndef _VIRTIO_LIB_H_\r
#define _VIRTIO_LIB_H_\r
\r
#include <Protocol/VirtioDevice.h>\r
\r
#include <IndustryStandard/Virtio.h>\r
\r
\r
/**\r
\r
  Configure a virtio ring.\r
\r
  This function sets up internal storage (the guest-host communication area)\r
  and lays out several "navigation" (ie. no-ownership) pointers to parts of\r
  that storage.\r
\r
  Relevant sections from the virtio-0.9.5 spec:\r
  - 1.1 Virtqueues,\r
  - 2.3 Virtqueue Configuration.\r
\r
  @param[in]  VirtIo            The virtio device which will use the ring.\r
\r
  @param[in]                    The number of descriptors to allocate for the\r
                                virtio ring, as requested by the host.\r
\r
  @param[out] Ring              The virtio ring to set up.\r
\r
  @return                       Status codes propagated from\r
                                VirtIo->AllocateSharedPages().\r
\r
  @retval EFI_SUCCESS           Allocation and setup successful. Ring->Base\r
                                (and nothing else) is responsible for\r
                                deallocation.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
VirtioRingInit (\r
  IN  VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
  IN  UINT16                 QueueSize,\r
  OUT VRING                  *Ring\r
  );\r
\r
\r
/**\r
\r
  Map the ring buffer so that it can be accessed equally by both guest\r
  and hypervisor.\r
\r
  @param[in]      VirtIo          The virtio device instance.\r
\r
  @param[in]      Ring            The virtio ring to map.\r
\r
  @param[out]     RingBaseShift   A resulting translation offset, to be\r
                                  passed to VirtIo->SetQueueAddress().\r
\r
  @param[out]     Mapping         A resulting token to pass to\r
                                  VirtIo->UnmapSharedBuffer().\r
\r
  @return         Status code from VirtIo->MapSharedBuffer()\r
**/\r
EFI_STATUS\r
EFIAPI\r
VirtioRingMap (\r
  IN  VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
  IN  VRING                  *Ring,\r
  OUT UINT64                 *RingBaseShift,\r
  OUT VOID                   **Mapping\r
  );\r
\r
/**\r
\r
  Tear down the internal resources of a configured virtio ring.\r
\r
  The caller is responsible to stop the host from using this ring before\r
  invoking this function: the VSTAT_DRIVER_OK bit must be clear in\r
  VhdrDeviceStatus.\r
\r
  @param[in]  VirtIo  The virtio device which was using the ring.\r
\r
  @param[out] Ring    The virtio ring to clean up.\r
\r
**/\r
VOID\r
EFIAPI\r
VirtioRingUninit (\r
  IN     VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
  IN OUT VRING                  *Ring\r
  );\r
\r
\r
//\r
// Internal use structure for tracking the submission of a multi-descriptor\r
// request.\r
//\r
typedef struct {\r
  UINT16 HeadDescIdx;\r
  UINT16 NextDescIdx;\r
} DESC_INDICES;\r
\r
\r
/**\r
\r
  Turn off interrupt notifications from the host, and prepare for appending\r
  multiple descriptors to the virtio ring.\r
\r
  The calling driver must be in VSTAT_DRIVER_OK state.\r
\r
  @param[in,out] Ring  The virtio ring we intend to append descriptors to.\r
\r
  @param[out] Indices  The DESC_INDICES structure to initialize.\r
\r
**/\r
VOID\r
EFIAPI\r
VirtioPrepare (\r
  IN OUT VRING        *Ring,\r
  OUT    DESC_INDICES *Indices\r
  );\r
\r
\r
/**\r
\r
  Append a contiguous buffer for transmission / reception via the virtio ring.\r
\r
  This function implements the following section from virtio-0.9.5:\r
  - 2.4.1.1 Placing Buffers into the Descriptor Table\r
\r
  Free space is taken as granted, since the individual drivers support only\r
  synchronous requests and host side status is processed in lock-step with\r
  request submission. It is the calling driver's responsibility to verify the\r
  ring size in advance.\r
\r
  The caller is responsible for initializing *Indices with VirtioPrepare()\r
  first.\r
\r
  @param[in,out] Ring               The virtio ring to append the buffer to,\r
                                    as a descriptor.\r
\r
  @param[in] BufferDeviceAddress    (Bus master device) start address of the\r
                                    transmit / receive buffer.\r
\r
  @param[in] BufferSize             Number of bytes to transmit or receive.\r
\r
  @param[in] Flags                  A bitmask of VRING_DESC_F_* flags. The\r
                                    caller computes this mask dependent on\r
                                    further buffers to append and transfer\r
                                    direction. VRING_DESC_F_INDIRECT is\r
                                    unsupported. The VRING_DESC.Next field is\r
                                    always set, but the host only interprets\r
                                    it dependent on VRING_DESC_F_NEXT.\r
\r
  @param[in,out] Indices            Indices->HeadDescIdx is not accessed.\r
                                    On input, Indices->NextDescIdx identifies\r
                                    the next descriptor to carry the buffer.\r
                                    On output, Indices->NextDescIdx is\r
                                    incremented by one, modulo 2^16.\r
\r
**/\r
VOID\r
EFIAPI\r
VirtioAppendDesc (\r
  IN OUT VRING        *Ring,\r
  IN     UINT64       BufferDeviceAddress,\r
  IN     UINT32       BufferSize,\r
  IN     UINT16       Flags,\r
  IN OUT DESC_INDICES *Indices\r
  );\r
\r
\r
/**\r
\r
  Notify the host about the descriptor chain just built, and wait until the\r
  host processes it.\r
\r
  @param[in] VirtIo       The target virtio device to notify.\r
\r
  @param[in] VirtQueueId  Identifies the queue for the target device.\r
\r
  @param[in,out] Ring     The virtio ring with descriptors to submit.\r
\r
  @param[in] Indices      Indices->NextDescIdx is not accessed.\r
                          Indices->HeadDescIdx identifies the head descriptor\r
                          of the descriptor chain.\r
\r
  @param[out] UsedLen     On success, the total number of bytes, consecutively\r
                          across the buffers linked by the descriptor chain,\r
                          that the host wrote. May be NULL if the caller\r
                          doesn't care, or can compute the same information\r
                          from device-specific request structures linked by the\r
                          descriptor chain.\r
\r
  @return              Error code from VirtIo->SetQueueNotify() if it fails.\r
\r
  @retval EFI_SUCCESS  Otherwise, the host processed all descriptors.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
VirtioFlush (\r
  IN     VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
  IN     UINT16                 VirtQueueId,\r
  IN OUT VRING                  *Ring,\r
  IN     DESC_INDICES           *Indices,\r
  OUT    UINT32                 *UsedLen    OPTIONAL\r
  );\r
\r
\r
/**\r
\r
  Report the feature bits to the VirtIo 1.0 device that the VirtIo 1.0 driver\r
  understands.\r
\r
  In VirtIo 1.0, a device can reject a self-inconsistent feature bitmap through\r
  the new VSTAT_FEATURES_OK status bit. (For example if the driver requests a\r
  higher level feature but clears a prerequisite feature.) This function is a\r
  small wrapper around VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures() that also\r
  verifies if the VirtIo 1.0 device accepts the feature bitmap.\r
\r
  @param[in]     VirtIo        Report feature bits to this device.\r
\r
  @param[in]     Features      The set of feature bits that the driver wishes\r
                               to report. The caller is responsible to perform\r
                               any masking before calling this function; the\r
                               value is directly written with\r
                               VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures().\r
\r
  @param[in,out] DeviceStatus  On input, the status byte most recently written\r
                               to the device's status register. On output (even\r
                               on error), DeviceStatus will be updated so that\r
                               it is suitable for further status bit\r
                               manipulation and writing to the device's status\r
                               register.\r
\r
  @retval  EFI_SUCCESS      The device accepted the configuration in Features.\r
\r
  @return  EFI_UNSUPPORTED  The device rejected the configuration in Features.\r
\r
  @retval  EFI_UNSUPPORTED  VirtIo->Revision is smaller than 1.0.0.\r
\r
  @return                   Error codes from the SetGuestFeatures(),\r
                            SetDeviceStatus(), GetDeviceStatus() member\r
                            functions.\r
\r
**/\r
EFI_STATUS\r
EFIAPI\r
Virtio10WriteFeatures (\r
  IN     VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
  IN     UINT64                 Features,\r
  IN OUT UINT8                  *DeviceStatus\r
  );\r
\r
/**\r
  Provides the virtio device address required to access system memory from a\r
  DMA bus master.\r
\r
  The interface follows the same usage pattern as defined in UEFI spec 2.6\r
  (Section 13.2 PCI Root Bridge I/O Protocol)\r
\r
  The VirtioMapAllBytesInSharedBuffer() is similar to VIRTIO_MAP_SHARED\r
  with exception that NumberOfBytes is IN-only parameter. The function\r
  maps all the bytes specified in NumberOfBytes param in one consecutive\r
  range.\r
\r
  @param[in]     VirtIo           The virtio device for which the mapping is\r
                                  requested.\r
\r
  @param[in]     Operation        Indicates if the bus master is going to\r
                                  read or write to system memory.\r
\r
  @param[in]     HostAddress      The system memory address to map to shared\r
                                  buffer address.\r
\r
  @param[in]     NumberOfBytes    Number of bytes to map.\r
\r
  @param[out]    DeviceAddress    The resulting shared map address for the\r
                                  bus master to access the hosts HostAddress.\r
\r
  @param[out]    Mapping          A resulting token to pass to\r
                                  VIRTIO_UNMAP_SHARED.\r
\r
\r
  @retval EFI_SUCCESS             The NumberOfBytes is successfully mapped.\r
  @retval EFI_UNSUPPORTED         The HostAddress cannot be mapped as a\r
                                  common buffer.\r
  @retval EFI_INVALID_PARAMETER   One or more parameters are invalid.\r
  @retval EFI_OUT_OF_RESOURCES    The request could not be completed due to\r
                                  a lack of resources. This includes the case\r
                                  when NumberOfBytes bytes cannot be mapped\r
                                  in one consecutive range.\r
  @retval EFI_DEVICE_ERROR        The system hardware could not map the\r
                                  requested address.\r
**/\r
EFI_STATUS\r
EFIAPI\r
VirtioMapAllBytesInSharedBuffer (\r
  IN  VIRTIO_DEVICE_PROTOCOL  *VirtIo,\r
  IN  VIRTIO_MAP_OPERATION    Operation,\r
  IN  VOID                    *HostAddress,\r
  IN  UINTN                   NumberOfBytes,\r
  OUT EFI_PHYSICAL_ADDRESS    *DeviceAddress,\r
  OUT VOID                    **Mapping\r
  );\r
#endif // _VIRTIO_LIB_H_\r
Commit	Line	Data
263559b8	1	/** @file\r
	2	\r
	3	Declarations of utility functions used by virtio device drivers.\r
	4	\r
8bc951a2	5	Copyright (C) 2012-2016, Red Hat, Inc.\r
0a78d754	6	Copyright (C) 2017, AMD Inc, All rights reserved.<BR>\r
263559b8	7	\r
b26f0cf9	8	SPDX-License-Identifier: BSD-2-Clause-Patent\r
263559b8	9	\r
	10	**/\r
	11	\r
	12	#ifndef _VIRTIO_LIB_H_\r
	13	#define _VIRTIO_LIB_H_\r
	14	\r
56f65ed8 OM	15	#include <Protocol/VirtioDevice.h>\r
56f65ed8 OM	16	\r
263559b8	17	#include <IndustryStandard/Virtio.h>\r
263559b8	18	\r
263559b8	19	\r
	20	/**\r
	21	\r
	22	Configure a virtio ring.\r
	23	\r
	24	This function sets up internal storage (the guest-host communication area)\r
	25	and lays out several "navigation" (ie. no-ownership) pointers to parts of\r
	26	that storage.\r
	27	\r
	28	Relevant sections from the virtio-0.9.5 spec:\r
	29	- 1.1 Virtqueues,\r
	30	- 2.3 Virtqueue Configuration.\r
	31	\r
fc2c1543 BS	32	@param[in] VirtIo The virtio device which will use the ring.\r
fc2c1543 BS	33	\r
263559b8	34	@param[in] The number of descriptors to allocate for the\r
	35	virtio ring, as requested by the host.\r
	36	\r
	37	@param[out] Ring The virtio ring to set up.\r
	38	\r
b0338c53 BS	39	@return Status codes propagated from\r
b0338c53 BS	40	VirtIo->AllocateSharedPages().\r
263559b8	41	\r
	42	@retval EFI_SUCCESS Allocation and setup successful. Ring->Base\r
	43	(and nothing else) is responsible for\r
	44	deallocation.\r
	45	\r
	46	**/\r
	47	EFI_STATUS\r
	48	EFIAPI\r
	49	VirtioRingInit (\r
fc2c1543 BS	50	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	51	IN UINT16 QueueSize,\r
	52	OUT VRING *Ring\r
263559b8	53	);\r
	54	\r
	55	\r
fef6becb BS	56	/**\r
	57	\r
	58	Map the ring buffer so that it can be accessed equally by both guest\r
	59	and hypervisor.\r
	60	\r
	61	@param[in] VirtIo The virtio device instance.\r
	62	\r
	63	@param[in] Ring The virtio ring to map.\r
	64	\r
	65	@param[out] RingBaseShift A resulting translation offset, to be\r
	66	passed to VirtIo->SetQueueAddress().\r
	67	\r
	68	@param[out] Mapping A resulting token to pass to\r
	69	VirtIo->UnmapSharedBuffer().\r
	70	\r
	71	@return Status code from VirtIo->MapSharedBuffer()\r
	72	**/\r
	73	EFI_STATUS\r
	74	EFIAPI\r
	75	VirtioRingMap (\r
	76	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	77	IN VRING *Ring,\r
	78	OUT UINT64 *RingBaseShift,\r
	79	OUT VOID **Mapping\r
	80	);\r
	81	\r
263559b8	82	/**\r
	83	\r
	84	Tear down the internal resources of a configured virtio ring.\r
	85	\r
	86	The caller is responsible to stop the host from using this ring before\r
	87	invoking this function: the VSTAT_DRIVER_OK bit must be clear in\r
	88	VhdrDeviceStatus.\r
	89	\r
fc2c1543 BS	90	@param[in] VirtIo The virtio device which was using the ring.\r
	91	\r
	92	@param[out] Ring The virtio ring to clean up.\r
263559b8	93	\r
	94	**/\r
	95	VOID\r
	96	EFIAPI\r
	97	VirtioRingUninit (\r
fc2c1543 BS	98	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
fc2c1543 BS	99	IN OUT VRING *Ring\r
263559b8	100	);\r
	101	\r
	102	\r
e371e7e5	103	//\r
	104	// Internal use structure for tracking the submission of a multi-descriptor\r
	105	// request.\r
	106	//\r
	107	typedef struct {\r
635a3ca2	108	UINT16 HeadDescIdx;\r
635a3ca2	109	UINT16 NextDescIdx;\r
e371e7e5	110	} DESC_INDICES;\r
	111	\r
	112	\r
	113	/**\r
	114	\r
	115	Turn off interrupt notifications from the host, and prepare for appending\r
	116	multiple descriptors to the virtio ring.\r
	117	\r
	118	The calling driver must be in VSTAT_DRIVER_OK state.\r
	119	\r
f2965f4e	120	@param[in,out] Ring The virtio ring we intend to append descriptors to.\r
e371e7e5	121	\r
	122	@param[out] Indices The DESC_INDICES structure to initialize.\r
	123	\r
	124	**/\r
	125	VOID\r
	126	EFIAPI\r
	127	VirtioPrepare (\r
	128	IN OUT VRING *Ring,\r
	129	OUT DESC_INDICES *Indices\r
	130	);\r
	131	\r
	132	\r
263559b8	133	/**\r
	134	\r
	135	Append a contiguous buffer for transmission / reception via the virtio ring.\r
	136	\r
635a3ca2	137	This function implements the following section from virtio-0.9.5:\r
263559b8	138	- 2.4.1.1 Placing Buffers into the Descriptor Table\r
263559b8	139	\r
	140	Free space is taken as granted, since the individual drivers support only\r
	141	synchronous requests and host side status is processed in lock-step with\r
	142	request submission. It is the calling driver's responsibility to verify the\r
	143	ring size in advance.\r
	144	\r
e371e7e5	145	The caller is responsible for initializing *Indices with VirtioPrepare()\r
	146	first.\r
	147	\r
4b725858 BS	148	@param[in,out] Ring The virtio ring to append the buffer to,\r
4b725858 BS	149	as a descriptor.\r
11a5fdf4	150	\r
4b725858 BS	151	@param[in] BufferDeviceAddress (Bus master device) start address of the\r
4b725858 BS	152	transmit / receive buffer.\r
11a5fdf4	153	\r
4b725858	154	@param[in] BufferSize Number of bytes to transmit or receive.\r
11a5fdf4	155	\r
4b725858 BS	156	@param[in] Flags A bitmask of VRING_DESC_F_* flags. The\r
	157	caller computes this mask dependent on\r
	158	further buffers to append and transfer\r
	159	direction. VRING_DESC_F_INDIRECT is\r
	160	unsupported. The VRING_DESC.Next field is\r
	161	always set, but the host only interprets\r
	162	it dependent on VRING_DESC_F_NEXT.\r
11a5fdf4	163	\r
4b725858 BS	164	@param[in,out] Indices Indices->HeadDescIdx is not accessed.\r
	165	On input, Indices->NextDescIdx identifies\r
	166	the next descriptor to carry the buffer.\r
	167	On output, Indices->NextDescIdx is\r
	168	incremented by one, modulo 2^16.\r
263559b8	169	\r
	170	**/\r
	171	VOID\r
	172	EFIAPI\r
7fcacd6c	173	VirtioAppendDesc (\r
e371e7e5	174	IN OUT VRING *Ring,\r
4b725858	175	IN UINT64 BufferDeviceAddress,\r
e371e7e5	176	IN UINT32 BufferSize,\r
	177	IN UINT16 Flags,\r
	178	IN OUT DESC_INDICES *Indices\r
	179	);\r
	180	\r
	181	\r
	182	/**\r
	183	\r
635a3ca2	184	Notify the host about the descriptor chain just built, and wait until the\r
635a3ca2	185	host processes it.\r
e371e7e5	186	\r
56f65ed8	187	@param[in] VirtIo The target virtio device to notify.\r
e371e7e5	188	\r
	189	@param[in] VirtQueueId Identifies the queue for the target device.\r
	190	\r
a7615fa8	191	@param[in,out] Ring The virtio ring with descriptors to submit.\r
e371e7e5	192	\r
a7615fa8	193	@param[in] Indices Indices->NextDescIdx is not accessed.\r
	194	Indices->HeadDescIdx identifies the head descriptor\r
	195	of the descriptor chain.\r
e371e7e5	196	\r
8bc951a2 LE	197	@param[out] UsedLen On success, the total number of bytes, consecutively\r
	198	across the buffers linked by the descriptor chain,\r
	199	that the host wrote. May be NULL if the caller\r
	200	doesn't care, or can compute the same information\r
	201	from device-specific request structures linked by the\r
	202	descriptor chain.\r
e371e7e5	203	\r
56f65ed8	204	@return Error code from VirtIo->SetQueueNotify() if it fails.\r
e371e7e5	205	\r
	206	@retval EFI_SUCCESS Otherwise, the host processed all descriptors.\r
	207	\r
	208	**/\r
	209	EFI_STATUS\r
	210	EFIAPI\r
	211	VirtioFlush (\r
56f65ed8 OM	212	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	213	IN UINT16 VirtQueueId,\r
	214	IN OUT VRING *Ring,\r
8bc951a2 LE	215	IN DESC_INDICES *Indices,\r
8bc951a2 LE	216	OUT UINT32 *UsedLen OPTIONAL\r
263559b8	217	);\r
263559b8	218	\r
d0ece0d8 LE	219	\r
	220	/**\r
	221	\r
	222	Report the feature bits to the VirtIo 1.0 device that the VirtIo 1.0 driver\r
	223	understands.\r
	224	\r
	225	In VirtIo 1.0, a device can reject a self-inconsistent feature bitmap through\r
	226	the new VSTAT_FEATURES_OK status bit. (For example if the driver requests a\r
	227	higher level feature but clears a prerequisite feature.) This function is a\r
	228	small wrapper around VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures() that also\r
	229	verifies if the VirtIo 1.0 device accepts the feature bitmap.\r
	230	\r
	231	@param[in] VirtIo Report feature bits to this device.\r
	232	\r
	233	@param[in] Features The set of feature bits that the driver wishes\r
	234	to report. The caller is responsible to perform\r
	235	any masking before calling this function; the\r
	236	value is directly written with\r
	237	VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures().\r
	238	\r
	239	@param[in,out] DeviceStatus On input, the status byte most recently written\r
	240	to the device's status register. On output (even\r
	241	on error), DeviceStatus will be updated so that\r
	242	it is suitable for further status bit\r
	243	manipulation and writing to the device's status\r
	244	register.\r
	245	\r
	246	@retval EFI_SUCCESS The device accepted the configuration in Features.\r
	247	\r
	248	@return EFI_UNSUPPORTED The device rejected the configuration in Features.\r
	249	\r
	250	@retval EFI_UNSUPPORTED VirtIo->Revision is smaller than 1.0.0.\r
	251	\r
	252	@return Error codes from the SetGuestFeatures(),\r
	253	SetDeviceStatus(), GetDeviceStatus() member\r
	254	functions.\r
	255	\r
	256	**/\r
	257	EFI_STATUS\r
	258	EFIAPI\r
	259	Virtio10WriteFeatures (\r
	260	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	261	IN UINT64 Features,\r
	262	IN OUT UINT8 *DeviceStatus\r
	263	);\r
	264	\r
0a78d754 BS	265	/**\r
	266	Provides the virtio device address required to access system memory from a\r
	267	DMA bus master.\r
	268	\r
	269	The interface follows the same usage pattern as defined in UEFI spec 2.6\r
	270	(Section 13.2 PCI Root Bridge I/O Protocol)\r
	271	\r
	272	The VirtioMapAllBytesInSharedBuffer() is similar to VIRTIO_MAP_SHARED\r
	273	with exception that NumberOfBytes is IN-only parameter. The function\r
	274	maps all the bytes specified in NumberOfBytes param in one consecutive\r
	275	range.\r
	276	\r
	277	@param[in] VirtIo The virtio device for which the mapping is\r
	278	requested.\r
	279	\r
	280	@param[in] Operation Indicates if the bus master is going to\r
	281	read or write to system memory.\r
	282	\r
	283	@param[in] HostAddress The system memory address to map to shared\r
	284	buffer address.\r
	285	\r
	286	@param[in] NumberOfBytes Number of bytes to map.\r
	287	\r
	288	@param[out] DeviceAddress The resulting shared map address for the\r
	289	bus master to access the hosts HostAddress.\r
	290	\r
	291	@param[out] Mapping A resulting token to pass to\r
	292	VIRTIO_UNMAP_SHARED.\r
	293	\r
	294	\r
9854561c	295	@retval EFI_SUCCESS The NumberOfBytes is successfully mapped.\r
0a78d754 BS	296	@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a\r
	297	common buffer.\r
	298	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r
	299	@retval EFI_OUT_OF_RESOURCES The request could not be completed due to\r
	300	a lack of resources. This includes the case\r
	301	when NumberOfBytes bytes cannot be mapped\r
	302	in one consecutive range.\r
	303	@retval EFI_DEVICE_ERROR The system hardware could not map the\r
	304	requested address.\r
	305	**/\r
	306	EFI_STATUS\r
	307	EFIAPI\r
	308	VirtioMapAllBytesInSharedBuffer (\r
	309	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	310	IN VIRTIO_MAP_OPERATION Operation,\r
	311	IN VOID *HostAddress,\r
	312	IN UINTN NumberOfBytes,\r
	313	OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,\r
	314	OUT VOID **Mapping\r
	315	);\r
263559b8	316	#endif // _VIRTIO_LIB_H_\r