| 1 | /** @file
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| 2 |
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| 3 | Virtio Block Device specific type and macro definitions corresponding to the
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| 4 | virtio-0.9.5 specification.
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| 5 |
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| 6 | Copyright (C) 2012, Red Hat, Inc.
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| 7 |
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| 8 | SPDX-License-Identifier: BSD-2-Clause-Patent
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| 9 |
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| 10 | **/
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| 11 |
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| 12 | #ifndef _VIRTIO_BLK_H_
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| 13 | #define _VIRTIO_BLK_H_
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| 14 |
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| 15 | #include <IndustryStandard/Virtio.h>
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| 16 |
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| 17 |
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| 18 | //
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| 19 | // virtio-0.9.5, Appendix D: Block Device
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| 20 | //
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| 21 | #pragma pack(1)
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| 22 | typedef struct {
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| 23 | UINT8 PhysicalBlockExp; // # of logical blocks per physical block (log2)
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| 24 | UINT8 AlignmentOffset; // offset of first aligned logical block
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| 25 | UINT16 MinIoSize; // suggested minimum I/O size in blocks
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| 26 | UINT32 OptIoSize; // optimal (suggested maximum) I/O size in blocks
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| 27 | } VIRTIO_BLK_TOPOLOGY;
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| 28 |
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| 29 | typedef struct {
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| 30 | UINT64 Capacity;
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| 31 | UINT32 SizeMax;
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| 32 | UINT32 SegMax;
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| 33 | UINT16 Cylinders;
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| 34 | UINT8 Heads;
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| 35 | UINT8 Sectors;
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| 36 | UINT32 BlkSize;
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| 37 | VIRTIO_BLK_TOPOLOGY Topology;
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| 38 | } VIRTIO_BLK_CONFIG;
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| 39 | #pragma pack()
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| 40 |
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| 41 | #define OFFSET_OF_VBLK(Field) OFFSET_OF (VIRTIO_BLK_CONFIG, Field)
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| 42 | #define SIZE_OF_VBLK(Field) (sizeof ((VIRTIO_BLK_CONFIG *) 0)->Field)
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| 43 |
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| 44 | #define VIRTIO_BLK_F_BARRIER BIT0
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| 45 | #define VIRTIO_BLK_F_SIZE_MAX BIT1
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| 46 | #define VIRTIO_BLK_F_SEG_MAX BIT2
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| 47 | #define VIRTIO_BLK_F_GEOMETRY BIT4
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| 48 | #define VIRTIO_BLK_F_RO BIT5
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| 49 | #define VIRTIO_BLK_F_BLK_SIZE BIT6 // treated as "logical block size" in
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| 50 | // practice; actual host side
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| 51 | // implementation negotiates "optimal"
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| 52 | // block size separately, via
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| 53 | // VIRTIO_BLK_F_TOPOLOGY
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| 54 | #define VIRTIO_BLK_F_SCSI BIT7
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| 55 | #define VIRTIO_BLK_F_FLUSH BIT9 // identical to "write cache enabled"
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| 56 | #define VIRTIO_BLK_F_TOPOLOGY BIT10 // information on optimal I/O alignment
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| 57 |
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| 58 | //
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| 59 | // We keep the status byte separate from the rest of the virtio-blk request
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| 60 | // header. See description of historical scattering at the end of Appendix D:
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| 61 | // we're going to put the status byte in a separate VRING_DESC.
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| 62 | //
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| 63 | #pragma pack(1)
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| 64 | typedef struct {
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| 65 | UINT32 Type;
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| 66 | UINT32 IoPrio;
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| 67 | UINT64 Sector;
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| 68 | } VIRTIO_BLK_REQ;
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| 69 | #pragma pack()
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| 70 |
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| 71 | #define VIRTIO_BLK_T_IN 0x00000000
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| 72 | #define VIRTIO_BLK_T_OUT 0x00000001
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| 73 | #define VIRTIO_BLK_T_SCSI_CMD 0x00000002
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| 74 | #define VIRTIO_BLK_T_SCSI_CMD_OUT 0x00000003
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| 75 | #define VIRTIO_BLK_T_FLUSH 0x00000004
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| 76 | #define VIRTIO_BLK_T_FLUSH_OUT 0x00000005
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| 77 | #define VIRTIO_BLK_T_BARRIER BIT31
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| 78 |
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| 79 | #define VIRTIO_BLK_S_OK 0x00
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| 80 | #define VIRTIO_BLK_S_IOERR 0x01
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| 81 | #define VIRTIO_BLK_S_UNSUPP 0x02
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| 82 |
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| 83 | #endif // _VIRTIO_BLK_H_
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