[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
  This program and the accompanying materials are licensed and made available\r
  under the terms and conditions of the BSD License which accompanies this\r
  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, WITHOUT\r
  WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\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, as a\r
                             descriptor.\r
\r
  @param[in] BufferPhysAddr  (Guest pseudo-physical) 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 caller\r
                             computes this mask dependent on further buffers to\r
                             append and transfer direction.\r
                             VRING_DESC_F_INDIRECT is unsupported. The\r
                             VRING_DESC.Next field is always set, but the host\r
                             only interprets it dependent on VRING_DESC_F_NEXT.\r
\r
  @param[in,out] Indices     Indices->HeadDescIdx is not accessed.\r
                             On input, Indices->NextDescIdx identifies the next\r
                             descriptor to carry the buffer. On output,\r
                             Indices->NextDescIdx is incremented by one, modulo\r
                             2^16.\r
\r
**/\r
VOID\r
EFIAPI\r
VirtioAppendDesc (\r
  IN OUT VRING        *Ring,\r
  IN     UINTN        BufferPhysAddr,\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 succesfully 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
	8	This program and the accompanying materials are licensed and made available\r
	9	under the terms and conditions of the BSD License which accompanies this\r
	10	distribution. The full text of the license may be found at\r
	11	http://opensource.org/licenses/bsd-license.php\r
	12	\r
	13	THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT\r
	14	WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.\r
	15	\r
	16	**/\r
	17	\r
	18	#ifndef _VIRTIO_LIB_H_\r
	19	#define _VIRTIO_LIB_H_\r
	20	\r
56f65ed8 OM	21	#include <Protocol/VirtioDevice.h>\r
56f65ed8 OM	22	\r
263559b8	23	#include <IndustryStandard/Virtio.h>\r
263559b8	24	\r
263559b8	25	\r
	26	/**\r
	27	\r
	28	Configure a virtio ring.\r
	29	\r
	30	This function sets up internal storage (the guest-host communication area)\r
	31	and lays out several "navigation" (ie. no-ownership) pointers to parts of\r
	32	that storage.\r
	33	\r
	34	Relevant sections from the virtio-0.9.5 spec:\r
	35	- 1.1 Virtqueues,\r
	36	- 2.3 Virtqueue Configuration.\r
	37	\r
fc2c1543 BS	38	@param[in] VirtIo The virtio device which will use the ring.\r
fc2c1543 BS	39	\r
263559b8	40	@param[in] The number of descriptors to allocate for the\r
	41	virtio ring, as requested by the host.\r
	42	\r
	43	@param[out] Ring The virtio ring to set up.\r
	44	\r
b0338c53 BS	45	@return Status codes propagated from\r
b0338c53 BS	46	VirtIo->AllocateSharedPages().\r
263559b8	47	\r
	48	@retval EFI_SUCCESS Allocation and setup successful. Ring->Base\r
	49	(and nothing else) is responsible for\r
	50	deallocation.\r
	51	\r
	52	**/\r
	53	EFI_STATUS\r
	54	EFIAPI\r
	55	VirtioRingInit (\r
fc2c1543 BS	56	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	57	IN UINT16 QueueSize,\r
	58	OUT VRING *Ring\r
263559b8	59	);\r
	60	\r
	61	\r
fef6becb BS	62	/**\r
	63	\r
	64	Map the ring buffer so that it can be accessed equally by both guest\r
	65	and hypervisor.\r
	66	\r
	67	@param[in] VirtIo The virtio device instance.\r
	68	\r
	69	@param[in] Ring The virtio ring to map.\r
	70	\r
	71	@param[out] RingBaseShift A resulting translation offset, to be\r
	72	passed to VirtIo->SetQueueAddress().\r
	73	\r
	74	@param[out] Mapping A resulting token to pass to\r
	75	VirtIo->UnmapSharedBuffer().\r
	76	\r
	77	@return Status code from VirtIo->MapSharedBuffer()\r
	78	**/\r
	79	EFI_STATUS\r
	80	EFIAPI\r
	81	VirtioRingMap (\r
	82	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	83	IN VRING *Ring,\r
	84	OUT UINT64 *RingBaseShift,\r
	85	OUT VOID **Mapping\r
	86	);\r
	87	\r
263559b8	88	/**\r
	89	\r
	90	Tear down the internal resources of a configured virtio ring.\r
	91	\r
	92	The caller is responsible to stop the host from using this ring before\r
	93	invoking this function: the VSTAT_DRIVER_OK bit must be clear in\r
	94	VhdrDeviceStatus.\r
	95	\r
fc2c1543 BS	96	@param[in] VirtIo The virtio device which was using the ring.\r
	97	\r
	98	@param[out] Ring The virtio ring to clean up.\r
263559b8	99	\r
	100	**/\r
	101	VOID\r
	102	EFIAPI\r
	103	VirtioRingUninit (\r
fc2c1543 BS	104	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
fc2c1543 BS	105	IN OUT VRING *Ring\r
263559b8	106	);\r
	107	\r
	108	\r
e371e7e5	109	//\r
	110	// Internal use structure for tracking the submission of a multi-descriptor\r
	111	// request.\r
	112	//\r
	113	typedef struct {\r
635a3ca2	114	UINT16 HeadDescIdx;\r
635a3ca2	115	UINT16 NextDescIdx;\r
e371e7e5	116	} DESC_INDICES;\r
	117	\r
	118	\r
	119	/**\r
	120	\r
	121	Turn off interrupt notifications from the host, and prepare for appending\r
	122	multiple descriptors to the virtio ring.\r
	123	\r
	124	The calling driver must be in VSTAT_DRIVER_OK state.\r
	125	\r
f2965f4e	126	@param[in,out] Ring The virtio ring we intend to append descriptors to.\r
e371e7e5	127	\r
	128	@param[out] Indices The DESC_INDICES structure to initialize.\r
	129	\r
	130	**/\r
	131	VOID\r
	132	EFIAPI\r
	133	VirtioPrepare (\r
	134	IN OUT VRING *Ring,\r
	135	OUT DESC_INDICES *Indices\r
	136	);\r
	137	\r
	138	\r
263559b8	139	/**\r
	140	\r
	141	Append a contiguous buffer for transmission / reception via the virtio ring.\r
	142	\r
635a3ca2	143	This function implements the following section from virtio-0.9.5:\r
263559b8	144	- 2.4.1.1 Placing Buffers into the Descriptor Table\r
263559b8	145	\r
	146	Free space is taken as granted, since the individual drivers support only\r
	147	synchronous requests and host side status is processed in lock-step with\r
	148	request submission. It is the calling driver's responsibility to verify the\r
	149	ring size in advance.\r
	150	\r
e371e7e5	151	The caller is responsible for initializing *Indices with VirtioPrepare()\r
	152	first.\r
	153	\r
11a5fdf4	154	@param[in,out] Ring The virtio ring to append the buffer to, as a\r
	155	descriptor.\r
	156	\r
	157	@param[in] BufferPhysAddr (Guest pseudo-physical) start address of the\r
	158	transmit / receive buffer.\r
	159	\r
	160	@param[in] BufferSize Number of bytes to transmit or receive.\r
	161	\r
	162	@param[in] Flags A bitmask of VRING_DESC_F_* flags. The caller\r
	163	computes this mask dependent on further buffers to\r
	164	append and transfer direction.\r
	165	VRING_DESC_F_INDIRECT is unsupported. The\r
	166	VRING_DESC.Next field is always set, but the host\r
	167	only interprets it dependent on VRING_DESC_F_NEXT.\r
	168	\r
	169	@param[in,out] Indices Indices->HeadDescIdx is not accessed.\r
	170	On input, Indices->NextDescIdx identifies the next\r
	171	descriptor to carry the buffer. On output,\r
	172	Indices->NextDescIdx is incremented by one, modulo\r
	173	2^16.\r
263559b8	174	\r
	175	**/\r
	176	VOID\r
	177	EFIAPI\r
7fcacd6c	178	VirtioAppendDesc (\r
e371e7e5	179	IN OUT VRING *Ring,\r
	180	IN UINTN BufferPhysAddr,\r
	181	IN UINT32 BufferSize,\r
	182	IN UINT16 Flags,\r
	183	IN OUT DESC_INDICES *Indices\r
	184	);\r
	185	\r
	186	\r
	187	/**\r
	188	\r
635a3ca2	189	Notify the host about the descriptor chain just built, and wait until the\r
635a3ca2	190	host processes it.\r
e371e7e5	191	\r
56f65ed8	192	@param[in] VirtIo The target virtio device to notify.\r
e371e7e5	193	\r
	194	@param[in] VirtQueueId Identifies the queue for the target device.\r
	195	\r
a7615fa8	196	@param[in,out] Ring The virtio ring with descriptors to submit.\r
e371e7e5	197	\r
a7615fa8	198	@param[in] Indices Indices->NextDescIdx is not accessed.\r
	199	Indices->HeadDescIdx identifies the head descriptor\r
	200	of the descriptor chain.\r
e371e7e5	201	\r
8bc951a2 LE	202	@param[out] UsedLen On success, the total number of bytes, consecutively\r
	203	across the buffers linked by the descriptor chain,\r
	204	that the host wrote. May be NULL if the caller\r
	205	doesn't care, or can compute the same information\r
	206	from device-specific request structures linked by the\r
	207	descriptor chain.\r
e371e7e5	208	\r
56f65ed8	209	@return Error code from VirtIo->SetQueueNotify() if it fails.\r
e371e7e5	210	\r
	211	@retval EFI_SUCCESS Otherwise, the host processed all descriptors.\r
	212	\r
	213	**/\r
	214	EFI_STATUS\r
	215	EFIAPI\r
	216	VirtioFlush (\r
56f65ed8 OM	217	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	218	IN UINT16 VirtQueueId,\r
	219	IN OUT VRING *Ring,\r
8bc951a2 LE	220	IN DESC_INDICES *Indices,\r
8bc951a2 LE	221	OUT UINT32 *UsedLen OPTIONAL\r
263559b8	222	);\r
263559b8	223	\r
d0ece0d8 LE	224	\r
	225	/**\r
	226	\r
	227	Report the feature bits to the VirtIo 1.0 device that the VirtIo 1.0 driver\r
	228	understands.\r
	229	\r
	230	In VirtIo 1.0, a device can reject a self-inconsistent feature bitmap through\r
	231	the new VSTAT_FEATURES_OK status bit. (For example if the driver requests a\r
	232	higher level feature but clears a prerequisite feature.) This function is a\r
	233	small wrapper around VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures() that also\r
	234	verifies if the VirtIo 1.0 device accepts the feature bitmap.\r
	235	\r
	236	@param[in] VirtIo Report feature bits to this device.\r
	237	\r
	238	@param[in] Features The set of feature bits that the driver wishes\r
	239	to report. The caller is responsible to perform\r
	240	any masking before calling this function; the\r
	241	value is directly written with\r
	242	VIRTIO_DEVICE_PROTOCOL.SetGuestFeatures().\r
	243	\r
	244	@param[in,out] DeviceStatus On input, the status byte most recently written\r
	245	to the device's status register. On output (even\r
	246	on error), DeviceStatus will be updated so that\r
	247	it is suitable for further status bit\r
	248	manipulation and writing to the device's status\r
	249	register.\r
	250	\r
	251	@retval EFI_SUCCESS The device accepted the configuration in Features.\r
	252	\r
	253	@return EFI_UNSUPPORTED The device rejected the configuration in Features.\r
	254	\r
	255	@retval EFI_UNSUPPORTED VirtIo->Revision is smaller than 1.0.0.\r
	256	\r
	257	@return Error codes from the SetGuestFeatures(),\r
	258	SetDeviceStatus(), GetDeviceStatus() member\r
	259	functions.\r
	260	\r
	261	**/\r
	262	EFI_STATUS\r
	263	EFIAPI\r
	264	Virtio10WriteFeatures (\r
	265	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	266	IN UINT64 Features,\r
	267	IN OUT UINT8 *DeviceStatus\r
	268	);\r
	269	\r
0a78d754 BS	270	/**\r
	271	Provides the virtio device address required to access system memory from a\r
	272	DMA bus master.\r
	273	\r
	274	The interface follows the same usage pattern as defined in UEFI spec 2.6\r
	275	(Section 13.2 PCI Root Bridge I/O Protocol)\r
	276	\r
	277	The VirtioMapAllBytesInSharedBuffer() is similar to VIRTIO_MAP_SHARED\r
	278	with exception that NumberOfBytes is IN-only parameter. The function\r
	279	maps all the bytes specified in NumberOfBytes param in one consecutive\r
	280	range.\r
	281	\r
	282	@param[in] VirtIo The virtio device for which the mapping is\r
	283	requested.\r
	284	\r
	285	@param[in] Operation Indicates if the bus master is going to\r
	286	read or write to system memory.\r
	287	\r
	288	@param[in] HostAddress The system memory address to map to shared\r
	289	buffer address.\r
	290	\r
	291	@param[in] NumberOfBytes Number of bytes to map.\r
	292	\r
	293	@param[out] DeviceAddress The resulting shared map address for the\r
	294	bus master to access the hosts HostAddress.\r
	295	\r
	296	@param[out] Mapping A resulting token to pass to\r
	297	VIRTIO_UNMAP_SHARED.\r
	298	\r
	299	\r
	300	@retval EFI_SUCCESS The NumberOfBytes is succesfully mapped.\r
	301	@retval EFI_UNSUPPORTED The HostAddress cannot be mapped as a\r
	302	common buffer.\r
	303	@retval EFI_INVALID_PARAMETER One or more parameters are invalid.\r
	304	@retval EFI_OUT_OF_RESOURCES The request could not be completed due to\r
	305	a lack of resources. This includes the case\r
	306	when NumberOfBytes bytes cannot be mapped\r
	307	in one consecutive range.\r
	308	@retval EFI_DEVICE_ERROR The system hardware could not map the\r
	309	requested address.\r
	310	**/\r
	311	EFI_STATUS\r
	312	EFIAPI\r
	313	VirtioMapAllBytesInSharedBuffer (\r
	314	IN VIRTIO_DEVICE_PROTOCOL *VirtIo,\r
	315	IN VIRTIO_MAP_OPERATION Operation,\r
	316	IN VOID *HostAddress,\r
	317	IN UINTN NumberOfBytes,\r
	318	OUT EFI_PHYSICAL_ADDRESS *DeviceAddress,\r
	319	OUT VOID **Mapping\r
	320	);\r
263559b8	321	#endif // _VIRTIO_LIB_H_\r