Why is the virtio-mmio implementation of the protocol a library,
instead of a driver binary?
The UEFI driver model would encourage to create a virtio-mmio driver
instead of a library. But the reasons why I created a library are:
- A virtio-mmio driver would imply an additional protocol that would
probably have a single attribute field:
typedef struct {
PHYSICAL_ADDRESS BaseAddress;
} VIRTIO_MMIO_DEVICE_PROTOCOL;
- There is no (easy) way to scan the available VirtIo devices on a
platform. So, the UEFI firmware for this platform would need a driver
to produce instances for every virtio devices it wants to expose in
UEFI. A single call to a helper library (ie: VirtioMmioDeviceLib)
make the porting easier.
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Olivier Martin <olivier.mar...@arm.com>
---
OvmfPkg/Include/Library/VirtioMmioDeviceLib.h | 65 +++++
.../Library/VirtioMmioDeviceLib/VirtioMmioDevice.c | 204 +++++++++++++
.../Library/VirtioMmioDeviceLib/VirtioMmioDevice.h | 147 ++++++++++
.../VirtioMmioDeviceFunctions.c | 304 ++++++++++++++++++++
.../VirtioMmioDeviceLib/VirtioMmioDeviceLib.inf | 43 +++
5 files changed, 763 insertions(+), 0 deletions(-)
create mode 100644 OvmfPkg/Include/Library/VirtioMmioDeviceLib.h
create mode 100644 OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
create mode 100644 OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
create mode 100644
OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
create mode 100644 OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceLib.inf
diff --git a/OvmfPkg/Include/Library/VirtioMmioDeviceLib.h
b/OvmfPkg/Include/Library/VirtioMmioDeviceLib.h
new file mode 100644
index 0000000..ac71014
--- /dev/null
+++ b/OvmfPkg/Include/Library/VirtioMmioDeviceLib.h
@@ -0,0 +1,65 @@
+/** @file
+
+ Definitions for the VirtIo MMIO Device Library
+
+ Copyright (C) 2013, ARM Ltd
+
+ 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_MMIO_DEVICE_LIB_H_
+#define _VIRTIO_MMIO_DEVICE_LIB_H_
+
+/**
+
+ Initialize VirtIo Device and Install VIRTIO_DEVICE_PROTOCOL protocol
+
+ @param[in] BaseAddress Base Address of the VirtIo MMIO Device
+
+ @param[in] Handle Handle of the device the driver should be attached
to.
+
+ @retval EFI_SUCCESS The VirtIo Device has been installed
+ successfully.
+
+ @retval EFI_OUT_OF_RESOURCES The function failed too allocate memory require
+ by the Virtio MMIO device initialization.
+
+ @retval EFI_UNSUPPORTED BaseAddress does not point to a VirtIo MMIO
+ device.
+
+ @return Status code returned by
InstallProtocolInterface
+ Boot Service function.
+
+**/
+EFI_STATUS
+VirtioMmioInstallDevice (
+ IN PHYSICAL_ADDRESS BaseAddress,
+ IN EFI_HANDLE Handle
+ );
+
+/**
+
+ Uninstall the VirtIo Device
+
+ @param[in] Handle Handle of the device where the VirtIo Device protocol
+ should have been installed.
+
+ @retval EFI_SUCCESS The device has been un-initialized successfully.
+
+ @return Status code returned by UninstallProtocolInterface
+ Boot Service function.
+
+**/
+EFI_STATUS
+VirtioMmioUninstallDevice (
+ IN EFI_HANDLE Handle
+ );
+
+#endif // _VIRTIO_MMIO_DEVICE_LIB_H_
diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
new file mode 100644
index 0000000..4d8578e
--- /dev/null
+++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.c
@@ -0,0 +1,204 @@
+/** @file
+
+ This driver produces Virtio Device Protocol instances for Virtio Mmio
devices.
+
+ Copyright (C) 2013, ARM Ltd.
+
+ 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.
+
+**/
+
+#include <Library/BaseMemoryLib.h>
+#include <Library/MemoryAllocationLib.h>
+#include <Library/UefiBootServicesTableLib.h>
+
+#include "VirtioMmioDevice.h"
+
+static VIRTIO_DEVICE_PROTOCOL mMmioDeviceProtocolTemplate = {
+ 0, // Revision
+ 0, // SubSystemDeviceId
+ VirtioMmioGetDeviceFeatures, // GetDeviceFeatures
+ VirtioMmioSetGuestFeatures, // SetGuestFeatures
+ VirtioMmioGetQueueAddress, // GetQueueAddress
+ VirtioMmioSetQueueAddress, // SetQueueAddress
+ VirtioMmioSetQueueSel, // SetQueueSel
+ VirtioMmioSetQueueNotify, // SetQueueNotify
+ VirtioMmioSetQueueAlignment, // SetQueueAlign
+ VirtioMmioSetPageSize, // SetPageSize
+ VirtioMmioGetQueueSize, // GetQueueNumMax
+ VirtioMmioSetQueueSize, // SetQueueNum
+ VirtioMmioGetDeviceStatus, // GetDeviceStatus
+ VirtioMmioSetDeviceStatus, // SetDeviceStatus
+ VirtioMmioDeviceWrite, // WriteDevice
+ VirtioMmioDeviceRead // ReadDevice
+};
+
+/**
+
+ Initialize the VirtIo MMIO Device
+
+ @param[in] BaseAddress Base Address of the VirtIo MMIO Device
+
+ @param[in, out] Device The driver instance to configure.
+
+ @retval EFI_SUCCESS Setup complete.
+
+ @retval EFI_UNSUPPORTED The driver is not a VirtIo MMIO device.
+
+**/
+STATIC
+EFI_STATUS
+EFIAPI
+VirtioMmioInit (
+ IN PHYSICAL_ADDRESS BaseAddress,
+ IN OUT VIRTIO_MMIO_DEVICE *Device
+ )
+{
+ UINT32 MagicValue;
+ UINT32 VendorId;
+ UINT32 Version;
+
+ // Initialize VirtIo Mmio Device
+ CopyMem (&Device->VirtioDevice, &mMmioDeviceProtocolTemplate,
+ sizeof (VIRTIO_DEVICE_PROTOCOL));
+ Device->BaseAddress = BaseAddress;
+ Device->VirtioDevice.Revision = VIRTIO_SPEC_REVISION (0, 9, 5);
+ Device->VirtioDevice.SubSystemDeviceId =
+ MmioRead32 (BaseAddress + VIRTIO_MMIO_OFFSET_DEVICE_ID);
+
+ // Double-check MMIO-specific values
+ MagicValue = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_MAGIC);
+ if (MagicValue != VIRTIO_MMIO_MAGIC) {
+ return EFI_UNSUPPORTED;
+ }
+
+ Version = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_VERSION);
+ if (Version != 1) {
+ return EFI_UNSUPPORTED;
+ }
+
+ // Double-check MMIO-specific values
+ VendorId = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_VENDOR_ID);
+ if (VendorId != VIRTIO_VENDOR_ID) {
+ // The ARM Base and Foundation Models do not report a valid VirtIo
VendorId.
+ // They return a value of 0x0 for the VendorId.
+ DEBUG((EFI_D_WARN, "VirtioMmioInit: Warning: The VendorId (0x%X) does not "
+ "match the VirtIo VendorId (0x%X).\n",
+ VendorId, VIRTIO_VENDOR_ID));
+ //return EFI_UNSUPPORTED;
+ }
+
+ return EFI_SUCCESS;
+}
+
+
+/**
+
+ Uninitialize the internals of a virtio-mmio device that has been successfully
+ set up with VirtioMmioInit().
+
+ @param[in, out] Device The device to clean up.
+
+**/
+
+STATIC
+VOID
+EFIAPI
+VirtioMmioUninit (
+ IN VIRTIO_MMIO_DEVICE *Device
+ )
+{
+ // Note: This function mirrors VirtioMmioInit() that does not allocate any
+ // resources - there's nothing to free here.
+}
+
+EFI_STATUS
+VirtioMmioInstallDevice (
+ IN PHYSICAL_ADDRESS BaseAddress,
+ IN EFI_HANDLE Handle
+ )
+{
+ EFI_STATUS Status;
+ VIRTIO_MMIO_DEVICE *VirtIo;
+
+ if (!BaseAddress) {
+ return EFI_INVALID_PARAMETER;
+ }
+ if (Handle == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ // Allocate VIRTIO_MMIO_DEVICE
+ VirtIo = AllocateZeroPool (sizeof (VIRTIO_MMIO_DEVICE));
+ if (VirtIo == NULL) {
+ return EFI_OUT_OF_RESOURCES;
+ }
+
+ VirtIo->Signature = VIRTIO_MMIO_DEVICE_SIGNATURE;
+
+ Status = VirtioMmioInit (BaseAddress, VirtIo);
+ if (EFI_ERROR (Status)) {
+ goto FreeVirtioMem;
+ }
+
+ // Install VIRTIO_DEVICE_PROTOCOL to Handle
+ Status = gBS->InstallProtocolInterface (&Handle,
+ &gVirtioDeviceProtocolGuid, EFI_NATIVE_INTERFACE,
+ &VirtIo->VirtioDevice);
+ if (EFI_ERROR (Status)) {
+ goto UninitVirtio;
+ }
+
+ return EFI_SUCCESS;
+
+UninitVirtio:
+ VirtioMmioUninit (VirtIo);
+
+FreeVirtioMem:
+ FreePool (VirtIo);
+ return Status;
+}
+
+EFI_STATUS
+VirtioMmioUninstallDevice (
+ IN EFI_HANDLE DeviceHandle
+ )
+{
+ VIRTIO_DEVICE_PROTOCOL *VirtioDevice;
+ VIRTIO_MMIO_DEVICE *MmioDevice;
+ EFI_STATUS Status;
+
+ Status = gBS->OpenProtocol (
+ DeviceHandle, // candidate device
+ &gVirtioDeviceProtocolGuid, // retrieve the VirtIo iface
+ (VOID **)&VirtioDevice, // target pointer
+ DeviceHandle, // requestor driver identity
+ DeviceHandle, // requesting lookup for dev.
+ EFI_OPEN_PROTOCOL_GET_PROTOCOL // lookup only, no ref. added
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ // Get the MMIO device from the VirtIo Device instance
+ MmioDevice = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (VirtioDevice);
+
+ // Uninstall the protocol interface
+ Status = gBS->UninstallProtocolInterface (DeviceHandle,
+ &gVirtioDeviceProtocolGuid, &MmioDevice->VirtioDevice
+ );
+ if (EFI_ERROR (Status)) {
+ return Status;
+ }
+
+ // Uninitialize the VirtIo Device
+ VirtioMmioUninit (MmioDevice);
+
+ return EFI_SUCCESS;
+}
diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
new file mode 100644
index 0000000..3e4e560
--- /dev/null
+++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDevice.h
@@ -0,0 +1,147 @@
+/** @file
+
+ Internal definitions for the VirtIo MMIO Device driver
+
+ Copyright (C) 2013, ARM Ltd
+
+ 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_MMIO_DEVICE_INTERNAL_H_
+#define _VIRTIO_MMIO_DEVICE_INTERNAL_H_
+
+#include <Protocol/VirtioDevice.h>
+
+#include <IndustryStandard/Virtio.h>
+
+#include <Library/DebugLib.h>
+#include <Library/IoLib.h>
+#include <Library/UefiLib.h>
+#include <Library/VirtioMmioDeviceLib.h>
+
+#define VIRTIO_MMIO_DEVICE_SIGNATURE SIGNATURE_32 ('V', 'M', 'I', 'O')
+
+typedef struct {
+ UINT32 Signature;
+ VIRTIO_DEVICE_PROTOCOL VirtioDevice;
+ PHYSICAL_ADDRESS BaseAddress;
+} VIRTIO_MMIO_DEVICE;
+
+#define VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE(Device) \
+ CR (Device, VIRTIO_MMIO_DEVICE, VirtioDevice, VIRTIO_MMIO_DEVICE_SIGNATURE)
+
+#define VIRTIO_CFG_WRITE(Device, Offset, Val) \
+ (MmioWrite32 (Device->BaseAddress + (Offset), Val))
+#define VIRTIO_CFG_READ(Device, Offset) \
+ (MmioRead32 (Device->BaseAddress + (Offset)))
+
+EFI_STATUS
+EFIAPI
+VirtioMmioDeviceRead (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ IN UINTN FieldOFfset,
+ IN UINTN FieldSize,
+ IN UINTN BufferSize,
+ OUT VOID* Buffer
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioDeviceWrite (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ IN UINTN FieldOffset,
+ IN UINTN FieldSize,
+ IN UINT64 Value
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioGetDeviceFeatures (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ OUT UINT32 *DeviceFeatures
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioGetQueueAddress (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ OUT UINT32 *QueueAddress
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioGetQueueSize (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ OUT UINT16 *QueueNumMax
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioGetDeviceStatus (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ OUT UINT8 *DeviceStatus
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetQueueSize (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT16 QueueSize
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetDeviceStatus (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT8 DeviceStatus
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetQueueNotify (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT16 QueueNotify
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetQueueSel (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT16 Sel
+ );
+
+EFI_STATUS
+VirtioMmioSetQueueAddress (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT32 Address
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetQueueAlignment (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT32 Alignment
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetPageSize (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT32 PageSize
+ );
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetGuestFeatures (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT32 Features
+ );
+
+#endif // _VIRTIO_MMIO_DEVICE_INTERNAL_H_
diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
new file mode 100644
index 0000000..bcba062
--- /dev/null
+++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceFunctions.c
@@ -0,0 +1,304 @@
+/** @file
+
+ This driver produces Virtio Device Protocol instances for Virtio MMIO
devices.
+
+ Copyright (C) 2012, Red Hat, Inc.
+ Copyright (c) 2012, Intel Corporation. All rights reserved.<BR>
+ Copyright (C) 2013, ARM Ltd.
+
+ 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.
+
+**/
+
+#include "VirtioMmioDevice.h"
+
+EFI_STATUS
+EFIAPI
+VirtioMmioGetDeviceFeatures (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ OUT UINT32 *DeviceFeatures
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ if (DeviceFeatures == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ *DeviceFeatures = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_HOST_FEATURES);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioGetQueueAddress (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ OUT UINT32 *QueueAddress
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ if (QueueAddress == NULL) {
+
+ }
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ *QueueAddress = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_QUEUE_PFN);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioGetQueueSize (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ OUT UINT16 *QueueNumMax
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ if (QueueNumMax == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ *QueueNumMax = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_QUEUE_NUM_MAX) &
0xFFFF;
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioGetDeviceStatus (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ OUT UINT8 *DeviceStatus
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ if (DeviceStatus == NULL) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ *DeviceStatus = VIRTIO_CFG_READ (Device, VIRTIO_MMIO_OFFSET_STATUS) & 0xFF;
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetQueueSize (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT16 QueueSize
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ return VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_NUM, QueueSize);
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetDeviceStatus (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT8 DeviceStatus
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_STATUS, DeviceStatus);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetQueueNotify (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT16 QueueNotify
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_NOTIFY, QueueNotify);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetQueueAlignment (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT32 Alignment
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_ALIGN, Alignment);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetPageSize (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT32 PageSize
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ ASSERT (PageSize == EFI_PAGE_SIZE);
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_PAGE_SIZE, PageSize);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetQueueSel (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT16 Sel
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_SEL, Sel);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+VirtioMmioSetQueueAddress (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT32 Address
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_QUEUE_PFN, Address);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioSetGuestFeatures (
+ VIRTIO_DEVICE_PROTOCOL *This,
+ UINT32 Features
+ )
+{
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ VIRTIO_CFG_WRITE (Device, VIRTIO_MMIO_OFFSET_GUEST_FEATURES, Features);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioDeviceWrite (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ IN UINTN FieldOffset,
+ IN UINTN FieldSize,
+ IN UINT64 Value
+ )
+{
+ UINTN DstBaseAddress;
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ // Double-check fieldsize
+ if (FieldSize > 8) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((FieldSize != 1) && (FieldSize != 2) &&
+ (FieldSize != 4) && (FieldSize != 8)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ // Compute base address
+ DstBaseAddress = Device->BaseAddress +
+ VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_MMIO + FieldOffset;
+
+ //
+ // The device-specific memory area of Virtio-MMIO can only be written in
+ // byte accesses. This is not currently in the Virtio spec.
+ //
+ MmioWriteBuffer8 (DstBaseAddress, FieldSize, (UINT8*)&Value);
+
+ return EFI_SUCCESS;
+}
+
+EFI_STATUS
+EFIAPI
+VirtioMmioDeviceRead (
+ IN VIRTIO_DEVICE_PROTOCOL *This,
+ IN UINTN FieldOffset,
+ IN UINTN FieldSize,
+ IN UINTN BufferSize,
+ OUT VOID *Buffer
+ )
+{
+ UINTN SrcBaseAddress;
+ VIRTIO_MMIO_DEVICE *Device;
+
+ Device = VIRTIO_MMIO_DEVICE_FROM_VIRTIO_DEVICE (This);
+
+ // Parameter validation
+ ASSERT (FieldSize == BufferSize);
+
+ // Double-check fieldsize
+ if (FieldSize > 8) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ if ((FieldSize != 1) && (FieldSize != 2) &&
+ (FieldSize != 4) && (FieldSize != 8)) {
+ return EFI_INVALID_PARAMETER;
+ }
+
+ // Compute base address
+ SrcBaseAddress = Device->BaseAddress +
+ VIRTIO_DEVICE_SPECIFIC_CONFIGURATION_OFFSET_MMIO + FieldOffset;
+
+ //
+ // The device-specific memory area of Virtio-MMIO can only be read in
+ // byte reads. This is not currently in the Virtio spec.
+ //
+ MmioReadBuffer8 (SrcBaseAddress, BufferSize, Buffer);
+
+ return EFI_SUCCESS;
+}
diff --git a/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceLib.inf
b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceLib.inf
new file mode 100644
index 0000000..126afec
--- /dev/null
+++ b/OvmfPkg/Library/VirtioMmioDeviceLib/VirtioMmioDeviceLib.inf
@@ -0,0 +1,43 @@
+## @file
+# This driver produces the VirtIo Device Protocol instances for VirtIo Mmio
+# Device
+#
+# Copyright (C) 2013, ARM Ltd
+#
+# 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.
+#
+##
+
+[Defines]
+ INF_VERSION = 0x00010006
+ BASE_NAME = VirtioMmioDeviceLib
+ FILE_GUID = 3b6ed966-b5d1-46a8-965b-867ff22d9c89
+ MODULE_TYPE = UEFI_DRIVER
+ VERSION_STRING = 1.0
+ LIBRARY_CLASS = VirtioMmioDeviceLib
+
+[Sources]
+ VirtioMmioDevice.c
+ VirtioMmioDeviceFunctions.c
+
+[Packages]
+ MdePkg/MdePkg.dec
+ OvmfPkg/OvmfPkg.dec
+
+[LibraryClasses]
+ BaseMemoryLib
+ DebugLib
+ IoLib
+ MemoryAllocationLib
+ UefiBootServicesTableLib
+ UefiDriverEntryPoint
+ UefiLib
+
+[Protocols]
+ gVirtioDeviceProtocolGuid ## PRODUCES
--
1.7.0.4
------------------------------------------------------------------------------
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