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Diffstat (limited to 'OvmfPkg/Include/Protocol/VirtioDevice.h')
| -rw-r--r-- | OvmfPkg/Include/Protocol/VirtioDevice.h | 376 |
1 files changed, 376 insertions, 0 deletions
diff --git a/OvmfPkg/Include/Protocol/VirtioDevice.h b/OvmfPkg/Include/Protocol/VirtioDevice.h new file mode 100644 index 000000000..cecac0541 --- /dev/null +++ b/OvmfPkg/Include/Protocol/VirtioDevice.h @@ -0,0 +1,376 @@ +/** @file + Virtio Device + + Copyright (c) 2013, ARM Ltd. All rights reserved.<BR> + + This program and the accompanying materials are licensed and made available + under the terms and conditions of the BSD License which 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. + +**/ + +#ifndef __VIRTIO_DEVICE_H__ +#define __VIRTIO_DEVICE_H__ + +// VirtIo Specification Revision: Major[31:24].Minor[23:16].Revision[15:0 +#define VIRTIO_SPEC_REVISION(major,minor,revision) \ + ((((major) & 0xFF) << 24) | (((minor) & 0xFF) << 16) | ((revision) & 0xFFFF)) + +#define VIRTIO_DEVICE_PROTOCOL_GUID { \ + 0xfa920010, 0x6785, 0x4941, {0xb6, 0xec, 0x49, 0x8c, 0x57, 0x9f, 0x16, 0x0a }\ + } + +typedef struct _VIRTIO_DEVICE_PROTOCOL VIRTIO_DEVICE_PROTOCOL; + +/** + + Read a word from the device-specific I/O region of the Virtio Header. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] FieldOffset Source offset. + + @param[in] FieldSize Source field size in bytes, must be in {1, 2, 4, 8}. + + @param[in] BufferSize Number of bytes available in the target buffer. Must + equal FieldSize. + + @param[out] Buffer Target buffer. + + @retval EFI_SUCCESS The data was read successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and read size. + @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a + lack of resources. + @retval EFI_INVALID_PARAMETER One or more parameters are invalid. + +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_DEVICE_READ) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINTN FieldOffset, + IN UINTN FieldSize, + IN UINTN BufferSize, + OUT VOID *Buffer + ); + +/** + + Write a word to the device-specific I/O region of the Virtio Header. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] FieldOffset Destination offset. + + @param[in] FieldSize Destination field size in bytes, + must be in {1, 2, 4, 8}. + + @param[out] Value Value to write. + + @retval EFI_SUCCESS The data was written successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and write size. + @retval EFI_OUT_OF_RESOURCES The request could not be completed due to a + lack of resources. + @retval EFI_INVALID_PARAMETER One or more parameters are invalid. + +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_DEVICE_WRITE) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINTN FieldOffset, + IN UINTN FieldSize, + IN UINT64 Value + ); + +/** + Read the device features field from the Virtio Header. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[out] DeviceFeatures The 32-bit device features field. + + @retval EFI_SUCCESS The data was read successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and read size. + @retval EFI_INVALID_PARAMETER DeviceFeatures is NULL +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_GET_DEVICE_FEATURES) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + OUT UINT32 *DeviceFeatures + ); + +/** + Write the guest features field in the Virtio Header. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] Features The 32-bit guest guest features field + +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_SET_GUEST_FEATURES) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINT32 Features + ); + +/** + Read the queue address field from the Virtio Header. + + QueueAddress is the address of the virtqueue divided by 4096. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[out] QueueAddress The 32-bit queue address field. + + @retval EFI_SUCCESS The data was read successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and read size. + @retval EFI_INVALID_PARAMETER QueueAddress is NULL +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_GET_QUEUE_ADDRESS) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + OUT UINT32 *QueueAddress + ); + +/** + Write the queue address field in the Virtio Header. + + The parameter Address must be the base address of the virtqueue divided + by 4096. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] Address The 32-bit Queue Address field + + @retval EFI_SUCCESS The data was written successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and write size. +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_SET_QUEUE_ADDRESS) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINT32 Address + ); + +/** + + Write the queue select field in the Virtio Header. + + Writing to the queue select field sets the index of the queue to which + operations such as SetQueueAlign and GetQueueNumMax apply. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] Index The index of the queue to select + + @retval EFI_SUCCESS The data was written successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and write size. +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_SET_QUEUE_SEL) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINT16 Index + ); + +/** + + Write the queue notify field in the Virtio Header. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] Address The 32-bit Queue Notify field + + @retval EFI_SUCCESS The data was written successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and write size. +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_SET_QUEUE_NOTIFY) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINT16 Index + ); + +/** + Write the queue alignment field in the Virtio Header. + + The queue to which the alignment applies is selected by the Queue Select + field. + + Note: This operation is not implemented by the VirtIo over PCI. The PCI + implementation of this protocol returns EFI_SUCCESS. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] Alignment The alignment boundary of the Used Ring in bytes. + Must be a power of 2. + + @retval EFI_SUCCESS The data was written successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and write size. +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_SET_QUEUE_ALIGN) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINT32 Alignment + ); + +/** + Write the guest page size. + + Note: This operation is not implemented by the VirtIo over PCI. The PCI + implementation of this protocol returns EFI_SUCCESS. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] PageSize Size of the Guest page in bytes. + Must be a power of 2. + + @retval EFI_SUCCESS The data was written successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and write size. +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_SET_PAGE_SIZE) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINT32 PageSize + ); + +/** + + Get the size of the virtqueue selected by the queue select field. + + See Virtio spec Section 2.3 + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[out] QueueNumMax The size of the virtqueue in bytes. + Always a power of 2. + + @retval EFI_SUCCESS The data was read successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and read size. + @retval EFI_INVALID_PARAMETER QueueNumMax is NULL +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_GET_QUEUE_NUM_MAX) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + OUT UINT16 *QueueNumMax + ); + +/** + + Write to the QueueNum field in the Virtio Header. + + This function only applies to Virtio-MMIO and may be a stub for other + implementations. See Virtio Spec appendix X. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] QueueSize The number of elements in the queue. + + @retval EFI_SUCCESS The data was written successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and write size. +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_SET_QUEUE_NUM) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINT16 QueueSize + ); + +/** + + Get the DeviceStatus field from the Virtio Header. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[out] DeviceStatus The 8-bit value for the Device status field + + @retval EFI_SUCCESS The data was read successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and read size. + @retval EFI_INVALID_PARAMETER DeviceStatus is NULL +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_GET_DEVICE_STATUS) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + OUT UINT8 *DeviceStatus + ); + +/** + + Write the DeviceStatus field in the Virtio Header. + + @param[in] This This instance of VIRTIO_DEVICE_PROTOCOL + + @param[in] DeviceStatus The 8-bit value for the Device status field + + @retval EFI_SUCCESS The data was written successfully. + @retval EFI_UNSUPPORTED The underlying IO device doesn't support the + provided address offset and write size. +**/ +typedef +EFI_STATUS +(EFIAPI *VIRTIO_SET_DEVICE_STATUS) ( + IN VIRTIO_DEVICE_PROTOCOL *This, + IN UINT8 DeviceStatus + ); + + +/// +/// This protocol provides an abstraction over the VirtIo transport layer +/// +struct _VIRTIO_DEVICE_PROTOCOL { + /// VirtIo Specification Revision encoded with VIRTIO_SPEC_REVISION() + UINT32 Revision; + /// From the Virtio Spec + INT32 SubSystemDeviceId; + + VIRTIO_GET_DEVICE_FEATURES GetDeviceFeatures; + VIRTIO_SET_GUEST_FEATURES SetGuestFeatures; + + VIRTIO_GET_QUEUE_ADDRESS GetQueueAddress; + VIRTIO_SET_QUEUE_ADDRESS SetQueueAddress; + + VIRTIO_SET_QUEUE_SEL SetQueueSel; + + VIRTIO_SET_QUEUE_NOTIFY SetQueueNotify; + + VIRTIO_SET_QUEUE_ALIGN SetQueueAlign; + VIRTIO_SET_PAGE_SIZE SetPageSize; + + VIRTIO_GET_QUEUE_NUM_MAX GetQueueNumMax; + VIRTIO_SET_QUEUE_NUM SetQueueNum; + + VIRTIO_GET_DEVICE_STATUS GetDeviceStatus; + VIRTIO_SET_DEVICE_STATUS SetDeviceStatus; + + // Functions to read/write Device Specific headers + VIRTIO_DEVICE_WRITE WriteDevice; + VIRTIO_DEVICE_READ ReadDevice; +}; + +extern EFI_GUID gVirtioDeviceProtocolGuid; + +#endif |