mirror of https://github.com/acidanthera/audk.git
90 lines
3.0 KiB
C
90 lines
3.0 KiB
C
/** @file
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Virtio Block Device specific type and macro definitions corresponding to the
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virtio-0.9.5 specification.
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Copyright (C) 2012, Red Hat, Inc.
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This program and the accompanying materials are licensed and made available
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under the terms and conditions of the BSD License which accompanies this
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distribution. The full text of the license may be found at
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http://opensource.org/licenses/bsd-license.php
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THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS, WITHOUT
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WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
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**/
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#ifndef _VIRTIO_BLK_H_
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#define _VIRTIO_BLK_H_
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#include <IndustryStandard/Virtio.h>
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//
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// virtio-0.9.5, Appendix D: Block Device
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//
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#pragma pack(1)
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typedef struct {
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UINT8 PhysicalBlockExp; // # of logical blocks per physical block (log2)
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UINT8 AlignmentOffset; // offset of first aligned logical block
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UINT16 MinIoSize; // suggested minimum I/O size in blocks
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UINT32 OptIoSize; // optimal (suggested maximum) I/O size in blocks
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} VIRTIO_BLK_TOPOLOGY;
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typedef struct {
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UINT64 Capacity;
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UINT32 SizeMax;
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UINT32 SegMax;
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UINT16 Cylinders;
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UINT8 Heads;
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UINT8 Sectors;
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UINT32 BlkSize;
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VIRTIO_BLK_TOPOLOGY Topology;
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} VIRTIO_BLK_CONFIG;
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#pragma pack()
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#define OFFSET_OF_VBLK(Field) OFFSET_OF (VIRTIO_BLK_CONFIG, Field)
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#define SIZE_OF_VBLK(Field) (sizeof ((VIRTIO_BLK_CONFIG *) 0)->Field)
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#define VIRTIO_BLK_F_BARRIER BIT0
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#define VIRTIO_BLK_F_SIZE_MAX BIT1
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#define VIRTIO_BLK_F_SEG_MAX BIT2
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#define VIRTIO_BLK_F_GEOMETRY BIT4
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#define VIRTIO_BLK_F_RO BIT5
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#define VIRTIO_BLK_F_BLK_SIZE BIT6 // treated as "logical block size" in
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// practice; actual host side
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// implementation negotiates "optimal"
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// block size separately, via
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// VIRTIO_BLK_F_TOPOLOGY
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#define VIRTIO_BLK_F_SCSI BIT7
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#define VIRTIO_BLK_F_FLUSH BIT9 // identical to "write cache enabled"
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#define VIRTIO_BLK_F_TOPOLOGY BIT10 // information on optimal I/O alignment
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//
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// We keep the status byte separate from the rest of the virtio-blk request
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// header. See description of historical scattering at the end of Appendix D:
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// we're going to put the status byte in a separate VRING_DESC.
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//
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#pragma pack(1)
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typedef struct {
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UINT32 Type;
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UINT32 IoPrio;
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UINT64 Sector;
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} VIRTIO_BLK_REQ;
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#pragma pack()
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#define VIRTIO_BLK_T_IN 0x00000000
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#define VIRTIO_BLK_T_OUT 0x00000001
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#define VIRTIO_BLK_T_SCSI_CMD 0x00000002
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#define VIRTIO_BLK_T_SCSI_CMD_OUT 0x00000003
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#define VIRTIO_BLK_T_FLUSH 0x00000004
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#define VIRTIO_BLK_T_FLUSH_OUT 0x00000005
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#define VIRTIO_BLK_T_BARRIER BIT31
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#define VIRTIO_BLK_S_OK 0x00
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#define VIRTIO_BLK_S_IOERR 0x01
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#define VIRTIO_BLK_S_UNSUPP 0x02
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#endif // _VIRTIO_BLK_H_
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