root / hw / virtio-blk.h @ 799e709b
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1 | 6e02c38d | aliguori | /*
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2 | 6e02c38d | aliguori | * Virtio Block Device
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3 | 6e02c38d | aliguori | *
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4 | 6e02c38d | aliguori | * Copyright IBM, Corp. 2007
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5 | 6e02c38d | aliguori | *
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6 | 6e02c38d | aliguori | * Authors:
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7 | 6e02c38d | aliguori | * Anthony Liguori <aliguori@us.ibm.com>
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8 | 6e02c38d | aliguori | *
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9 | 6e02c38d | aliguori | * This work is licensed under the terms of the GNU GPL, version 2. See
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10 | 6e02c38d | aliguori | * the COPYING file in the top-level directory.
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11 | 6e02c38d | aliguori | *
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12 | 6e02c38d | aliguori | */
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13 | 6e02c38d | aliguori | |
14 | 6e02c38d | aliguori | #ifndef _QEMU_VIRTIO_BLK_H
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15 | 6e02c38d | aliguori | #define _QEMU_VIRTIO_BLK_H
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16 | 6e02c38d | aliguori | |
17 | 6e02c38d | aliguori | #include "virtio.h" |
18 | 6e02c38d | aliguori | #include "block.h" |
19 | 6e02c38d | aliguori | #include "pci.h" |
20 | 6e02c38d | aliguori | |
21 | 6e02c38d | aliguori | /* from Linux's linux/virtio_blk.h */
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22 | 6e02c38d | aliguori | |
23 | 6e02c38d | aliguori | /* The ID for virtio_block */
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24 | 6e02c38d | aliguori | #define VIRTIO_ID_BLOCK 2 |
25 | 6e02c38d | aliguori | |
26 | 6e02c38d | aliguori | /* Feature bits */
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27 | 6e02c38d | aliguori | #define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ |
28 | 6e02c38d | aliguori | #define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ |
29 | 6e02c38d | aliguori | #define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ |
30 | 6e02c38d | aliguori | #define VIRTIO_BLK_F_GEOMETRY 4 /* Indicates support of legacy geometry */ |
31 | 6e02c38d | aliguori | |
32 | 6e02c38d | aliguori | struct virtio_blk_config
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33 | 6e02c38d | aliguori | { |
34 | 6e02c38d | aliguori | uint64_t capacity; |
35 | 6e02c38d | aliguori | uint32_t size_max; |
36 | 6e02c38d | aliguori | uint32_t seg_max; |
37 | 6e02c38d | aliguori | uint16_t cylinders; |
38 | 6e02c38d | aliguori | uint8_t heads; |
39 | 6e02c38d | aliguori | uint8_t sectors; |
40 | 6e02c38d | aliguori | } __attribute__((packed)); |
41 | 6e02c38d | aliguori | |
42 | 6e02c38d | aliguori | /* These two define direction. */
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43 | 6e02c38d | aliguori | #define VIRTIO_BLK_T_IN 0 |
44 | 6e02c38d | aliguori | #define VIRTIO_BLK_T_OUT 1 |
45 | 6e02c38d | aliguori | |
46 | 6e02c38d | aliguori | /* This bit says it's a scsi command, not an actual read or write. */
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47 | 6e02c38d | aliguori | #define VIRTIO_BLK_T_SCSI_CMD 2 |
48 | 6e02c38d | aliguori | |
49 | 6e02c38d | aliguori | /* Barrier before this op. */
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50 | 6e02c38d | aliguori | #define VIRTIO_BLK_T_BARRIER 0x80000000 |
51 | 6e02c38d | aliguori | |
52 | 6e02c38d | aliguori | /* This is the first element of the read scatter-gather list. */
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53 | 6e02c38d | aliguori | struct virtio_blk_outhdr
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54 | 6e02c38d | aliguori | { |
55 | 6e02c38d | aliguori | /* VIRTIO_BLK_T* */
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56 | 6e02c38d | aliguori | uint32_t type; |
57 | 6e02c38d | aliguori | /* io priority. */
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58 | 6e02c38d | aliguori | uint32_t ioprio; |
59 | 6e02c38d | aliguori | /* Sector (ie. 512 byte offset) */
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60 | 6e02c38d | aliguori | uint64_t sector; |
61 | 6e02c38d | aliguori | }; |
62 | 6e02c38d | aliguori | |
63 | 6e02c38d | aliguori | #define VIRTIO_BLK_S_OK 0 |
64 | 6e02c38d | aliguori | #define VIRTIO_BLK_S_IOERR 1 |
65 | 6e02c38d | aliguori | #define VIRTIO_BLK_S_UNSUPP 2 |
66 | 6e02c38d | aliguori | |
67 | 6e02c38d | aliguori | /* This is the first element of the write scatter-gather list */
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68 | 6e02c38d | aliguori | struct virtio_blk_inhdr
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69 | 6e02c38d | aliguori | { |
70 | 6e02c38d | aliguori | unsigned char status; |
71 | 6e02c38d | aliguori | }; |
72 | 6e02c38d | aliguori | |
73 | 9b32d5a5 | aliguori | void *virtio_blk_init(PCIBus *bus, BlockDriverState *bs);
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74 | 6e02c38d | aliguori | |
75 | 6e02c38d | aliguori | #endif |