diff options
Diffstat (limited to 'uclibc-crosstools-gcc-4.4.2-1/usr/include/linux/virtio_blk.h')
-rw-r--r-- | uclibc-crosstools-gcc-4.4.2-1/usr/include/linux/virtio_blk.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/uclibc-crosstools-gcc-4.4.2-1/usr/include/linux/virtio_blk.h b/uclibc-crosstools-gcc-4.4.2-1/usr/include/linux/virtio_blk.h new file mode 100644 index 0000000..94c56d2 --- /dev/null +++ b/uclibc-crosstools-gcc-4.4.2-1/usr/include/linux/virtio_blk.h @@ -0,0 +1,62 @@ +#ifndef _LINUX_VIRTIO_BLK_H +#define _LINUX_VIRTIO_BLK_H +/* This header is BSD licensed so anyone can use the definitions to implement + * compatible drivers/servers. */ +#include <linux/types.h> +#include <linux/virtio_config.h> + +/* The ID for virtio_block */ +#define VIRTIO_ID_BLOCK 2 + +/* Feature bits */ +#define VIRTIO_BLK_F_BARRIER 0 /* Does host support barriers? */ +#define VIRTIO_BLK_F_SIZE_MAX 1 /* Indicates maximum segment size */ +#define VIRTIO_BLK_F_SEG_MAX 2 /* Indicates maximum # of segments */ +#define VIRTIO_BLK_F_GEOMETRY 4 /* Legacy geometry available */ +#define VIRTIO_BLK_F_RO 5 /* Disk is read-only */ +#define VIRTIO_BLK_F_BLK_SIZE 6 /* Block size of disk is available*/ + +struct virtio_blk_config +{ + /* The capacity (in 512-byte sectors). */ + __u64 capacity; + /* The maximum segment size (if VIRTIO_BLK_F_SIZE_MAX) */ + __u32 size_max; + /* The maximum number of segments (if VIRTIO_BLK_F_SEG_MAX) */ + __u32 seg_max; + /* geometry the device (if VIRTIO_BLK_F_GEOMETRY) */ + struct virtio_blk_geometry { + __u16 cylinders; + __u8 heads; + __u8 sectors; + } geometry; + /* block size of device (if VIRTIO_BLK_F_BLK_SIZE) */ + __u32 blk_size; +} __attribute__((packed)); + +/* These two define direction. */ +#define VIRTIO_BLK_T_IN 0 +#define VIRTIO_BLK_T_OUT 1 + +/* This bit says it's a scsi command, not an actual read or write. */ +#define VIRTIO_BLK_T_SCSI_CMD 2 + +/* Barrier before this op. */ +#define VIRTIO_BLK_T_BARRIER 0x80000000 + +/* This is the first element of the read scatter-gather list. */ +struct virtio_blk_outhdr +{ + /* VIRTIO_BLK_T* */ + __u32 type; + /* io priority. */ + __u32 ioprio; + /* Sector (ie. 512 byte offset) */ + __u64 sector; +}; + +/* And this is the final byte of the write scatter-gather list. */ +#define VIRTIO_BLK_S_OK 0 +#define VIRTIO_BLK_S_IOERR 1 +#define VIRTIO_BLK_S_UNSUPP 2 +#endif /* _LINUX_VIRTIO_BLK_H */ |