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/** @file
Virtio Block Device specific type and macro definitions corresponding to the
virtio-0.9.5 specification.
Copyright (C) 2012, Red Hat, Inc.
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_BLK_H_
#define _VIRTIO_BLK_H_
#include <IndustryStandard/Virtio.h>
//
// virtio-0.9.5, Appendix D: Block Device
//
#pragma pack(1)
typedef struct {
UINT8 PhysicalBlockExp; // # of logical blocks per physical block (log2)
UINT8 AlignmentOffset; // offset of first aligned logical block
UINT16 MinIoSize; // suggested minimum I/O size in blocks
UINT32 OptIoSize; // optimal (suggested maximum) I/O size in blocks
} VIRTIO_BLK_TOPOLOGY;
typedef struct {
UINT64 Capacity;
UINT32 SizeMax;
UINT32 SegMax;
UINT16 Cylinders;
UINT8 Heads;
UINT8 Sectors;
UINT32 BlkSize;
VIRTIO_BLK_TOPOLOGY Topology;
} VIRTIO_BLK_CONFIG;
#pragma pack()
#define OFFSET_OF_VBLK(Field) OFFSET_OF (VIRTIO_BLK_CONFIG, Field)
#define SIZE_OF_VBLK(Field) (sizeof ((VIRTIO_BLK_CONFIG *) 0)->Field)
#define VIRTIO_BLK_F_BARRIER BIT0
#define VIRTIO_BLK_F_SIZE_MAX BIT1
#define VIRTIO_BLK_F_SEG_MAX BIT2
#define VIRTIO_BLK_F_GEOMETRY BIT4
#define VIRTIO_BLK_F_RO BIT5
#define VIRTIO_BLK_F_BLK_SIZE BIT6 // treated as "logical block size" in
// practice; actual host side
// implementation negotiates "optimal"
// block size separately, via
// VIRTIO_BLK_F_TOPOLOGY
#define VIRTIO_BLK_F_SCSI BIT7
#define VIRTIO_BLK_F_FLUSH BIT9 // identical to "write cache enabled"
#define VIRTIO_BLK_F_TOPOLOGY BIT10 // information on optimal I/O alignment
//
// We keep the status byte separate from the rest of the virtio-blk request
// header. See description of historical scattering at the end of Appendix D:
// we're going to put the status byte in a separate VRING_DESC.
//
#pragma pack(1)
typedef struct {
UINT32 Type;
UINT32 IoPrio;
UINT64 Sector;
} VIRTIO_BLK_REQ;
#pragma pack()
#define VIRTIO_BLK_T_IN 0x00000000
#define VIRTIO_BLK_T_OUT 0x00000001
#define VIRTIO_BLK_T_SCSI_CMD 0x00000002
#define VIRTIO_BLK_T_SCSI_CMD_OUT 0x00000003
#define VIRTIO_BLK_T_FLUSH 0x00000004
#define VIRTIO_BLK_T_FLUSH_OUT 0x00000005
#define VIRTIO_BLK_T_BARRIER BIT31
#define VIRTIO_BLK_S_OK 0x00
#define VIRTIO_BLK_S_IOERR 0x01
#define VIRTIO_BLK_S_UNSUPP 0x02
#endif // _VIRTIO_BLK_H_
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