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/******************************************************************************
* Copyright (c) 2011 IBM Corporation
* All rights reserved.
* This program and the accompanying materials
* are made available under the terms of the BSD License
* which accompanies this distribution, and is available at
* http://www.opensource.org/licenses/bsd-license.php
*
* Contributors:
* IBM Corporation - initial implementation
*****************************************************************************/
/*
* Virtio block device definitions.
* See Virtio Spec, Appendix D, for details
*/
#ifndef _VIRTIO_BLK_H
#define _VIRTIO_BLK_H
#include <stdint.h>
struct virtio_blk_cfg {
uint64_t capacity;
uint32_t size_max;
uint32_t seg_max;
struct virtio_blk_geometry {
uint16_t cylinders;
uint8_t heads;
uint8_t sectors;
} geometry;
uint32_t blk_size;
uint32_t sectors_max;
} __attribute__ ((packed)) ;
/* Block request */
struct virtio_blk_req {
uint32_t type ;
uint32_t ioprio ;
uint64_t sector ;
};
/* Block request types */
#define VIRTIO_BLK_T_IN 0
#define VIRTIO_BLK_T_OUT 1
#define VIRTIO_BLK_T_SCSI_CMD 2
#define VIRTIO_BLK_T_SCSI_CMD_OUT 3
#define VIRTIO_BLK_T_FLUSH 4
#define VIRTIO_BLK_T_FLUSH_OUT 5
#define VIRTIO_BLK_T_BARRIER 0x80000000
/* VIRTIO_BLK Feature bits */
#define VIRTIO_BLK_F_BLK_SIZE (1 << 6)
extern int virtioblk_init(struct virtio_device *dev);
extern void virtioblk_shutdown(struct virtio_device *dev);
extern int virtioblk_read(struct virtio_device *dev, char *buf, long blocknum, long cnt);
#endif /* _VIRTIO_BLK_H */
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