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/** @file
This driver produces Virtio Device Protocol instances for Virtio PCI 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 <Library/BaseMemoryLib.h>
#include <Library/DebugLib.h>
#include <Library/MemoryAllocationLib.h>
#include <Library/UefiBootServicesTableLib.h>
#include <Library/UefiLib.h>
#include "VirtioPciDevice.h"
/**
Read a word from Region 0 of the device specified by VirtIo Device protocol.
The function implements the ReadDevice protocol member of
VIRTIO_DEVICE_PROTOCOL.
@param[in] This VirtIo Device protocol.
@param[in] FieldOffset Source offset.
@param[in] FieldSize Source field size, 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.
@return Status code returned by PciIo->Io.Read().
**/
EFI_STATUS
EFIAPI
VirtioPciDeviceRead (
IN VIRTIO_DEVICE_PROTOCOL *This,
IN UINTN FieldOffset,
IN UINTN FieldSize,
IN UINTN BufferSize,
OUT VOID *Buffer
)
{
VIRTIO_PCI_DEVICE *Dev;
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoRead (Dev,
Dev->DeviceSpecificConfigurationOffset + FieldOffset,
FieldSize, BufferSize, Buffer);
}
/**
Write a word into Region 0 of the device specified by VirtIo Device protocol.
@param[in] This VirtIo Device protocol.
@param[in] FieldOffset Destination offset.
@param[in] FieldSize Destination field size, must be in { 1, 2, 4, 8 }.
@param[in] Value Little endian value to write, converted to UINT64.
The least significant FieldSize bytes will be used.
@return Status code returned by PciIo->Io.Write().
**/
EFI_STATUS
EFIAPI
VirtioPciDeviceWrite (
IN VIRTIO_DEVICE_PROTOCOL *This,
IN UINTN FieldOffset,
IN UINTN FieldSize,
IN UINT64 Value
)
{
VIRTIO_PCI_DEVICE *Dev;
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoWrite (Dev,
Dev->DeviceSpecificConfigurationOffset + FieldOffset, FieldSize, Value);
}
EFI_STATUS
EFIAPI
VirtioPciGetDeviceFeatures (
IN VIRTIO_DEVICE_PROTOCOL *This,
OUT UINT64 *DeviceFeatures
)
{
VIRTIO_PCI_DEVICE *Dev;
EFI_STATUS Status;
UINT32 Features32;
if (DeviceFeatures == NULL) {
return EFI_INVALID_PARAMETER;
}
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
Status = VirtioPciIoRead (Dev, VIRTIO_PCI_OFFSET_DEVICE_FEATURES,
sizeof (UINT32), sizeof (UINT32), &Features32);
if (!EFI_ERROR (Status)) {
*DeviceFeatures = Features32;
}
return Status;
}
EFI_STATUS
EFIAPI
VirtioPciGetQueueSize (
IN VIRTIO_DEVICE_PROTOCOL *This,
OUT UINT16 *QueueNumMax
)
{
VIRTIO_PCI_DEVICE *Dev;
if (QueueNumMax == NULL) {
return EFI_INVALID_PARAMETER;
}
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoRead (Dev, VIRTIO_PCI_OFFSET_QUEUE_SIZE, sizeof (UINT16),
sizeof (UINT16), QueueNumMax);
}
EFI_STATUS
EFIAPI
VirtioPciGetDeviceStatus (
IN VIRTIO_DEVICE_PROTOCOL *This,
OUT UINT8 *DeviceStatus
)
{
VIRTIO_PCI_DEVICE *Dev;
if (DeviceStatus == NULL) {
return EFI_INVALID_PARAMETER;
}
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoRead (Dev, VIRTIO_PCI_OFFSET_QUEUE_DEVICE_STATUS,
sizeof (UINT8), sizeof (UINT8), DeviceStatus);
}
EFI_STATUS
EFIAPI
VirtioPciSetGuestFeatures (
IN VIRTIO_DEVICE_PROTOCOL *This,
IN UINT64 Features
)
{
VIRTIO_PCI_DEVICE *Dev;
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
if (Features > MAX_UINT32) {
return EFI_UNSUPPORTED;
}
return VirtioPciIoWrite (Dev, VIRTIO_PCI_OFFSET_GUEST_FEATURES,
sizeof (UINT32), Features);
}
EFI_STATUS
EFIAPI
VirtioPciSetQueueAddress (
VIRTIO_DEVICE_PROTOCOL *This,
UINT32 Address
)
{
VIRTIO_PCI_DEVICE *Dev;
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoWrite (Dev, VIRTIO_PCI_OFFSET_QUEUE_ADDRESS, sizeof (UINT32),
Address);
}
EFI_STATUS
EFIAPI
VirtioPciSetQueueSel (
VIRTIO_DEVICE_PROTOCOL *This,
UINT16 Sel
)
{
VIRTIO_PCI_DEVICE *Dev;
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoWrite (Dev, VIRTIO_PCI_OFFSET_QUEUE_SELECT, sizeof (UINT16),
Sel);
}
EFI_STATUS
EFIAPI
VirtioPciSetQueueAlignment (
VIRTIO_DEVICE_PROTOCOL *This,
UINT32 Alignment
)
{
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
VirtioPciSetPageSize (
VIRTIO_DEVICE_PROTOCOL *This,
UINT32 PageSize
)
{
return (PageSize == EFI_PAGE_SIZE) ? EFI_SUCCESS : EFI_UNSUPPORTED;
}
EFI_STATUS
EFIAPI
VirtioPciSetQueueNotify (
VIRTIO_DEVICE_PROTOCOL *This,
UINT16 Index
)
{
VIRTIO_PCI_DEVICE *Dev;
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoWrite (Dev, VIRTIO_PCI_OFFSET_QUEUE_NOTIFY, sizeof (UINT16),
Index);
}
EFI_STATUS
EFIAPI
VirtioPciSetQueueSize (
VIRTIO_DEVICE_PROTOCOL *This,
UINT16 Size
)
{
//
// This function is only applicable in Virtio-MMIO.
// (The QueueSize field is read-only in Virtio proper (PCI))
//
return EFI_SUCCESS;
}
EFI_STATUS
EFIAPI
VirtioPciSetDeviceStatus (
VIRTIO_DEVICE_PROTOCOL *This,
UINT8 DeviceStatus
)
{
VIRTIO_PCI_DEVICE *Dev;
Dev = VIRTIO_PCI_DEVICE_FROM_VIRTIO_DEVICE (This);
return VirtioPciIoWrite (Dev, VIRTIO_PCI_OFFSET_QUEUE_DEVICE_STATUS,
sizeof (UINT8), DeviceStatus);
}
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