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/*
* Copyright (c) 2012 Stefan Fritsch.
* Copyright (c) 2010 Minoura Makoto.
* Copyright (c) 1998, 2001 Manuel Bouyer.
* All rights reserved.
*
* This code is based in part on the NetBSD ld_virtio driver and the
* OpenBSD wd driver.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* Configuration registers */
#define VIRTIO_BLK_CONFIG_CAPACITY 0 /* 64bit */
#define VIRTIO_BLK_CONFIG_SIZE_MAX 8 /* 32bit */
#define VIRTIO_BLK_CONFIG_SEG_MAX 12 /* 32bit */
#define VIRTIO_BLK_CONFIG_GEOMETRY_C 16 /* 16bit */
#define VIRTIO_BLK_CONFIG_GEOMETRY_H 18 /* 8bit */
#define VIRTIO_BLK_CONFIG_GEOMETRY_S 19 /* 8bit */
#define VIRTIO_BLK_CONFIG_BLK_SIZE 20 /* 32bit */
/* Feature bits */
#define VIRTIO_BLK_F_BARRIER (1<<0)
#define VIRTIO_BLK_F_SIZE_MAX (1<<1)
#define VIRTIO_BLK_F_SEG_MAX (1<<2)
#define VIRTIO_BLK_F_GEOMETRY (1<<4)
#define VIRTIO_BLK_F_RO (1<<5)
#define VIRTIO_BLK_F_BLK_SIZE (1<<6)
#define VIRTIO_BLK_F_SCSI (1<<7)
#define VIRTIO_BLK_F_FLUSH (1<<9)
#define VIRTIO_BLK_F_TOPOLOGY (1<<10)
/* Command */
#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_GET_ID 8 /* from qemu, not in spec, yet */
#define VIRTIO_BLK_T_BARRIER 0x80000000
/* Status */
#define VIRTIO_BLK_S_OK 0
#define VIRTIO_BLK_S_IOERR 1
#define VIRTIO_BLK_ID_BYTES 20 /* length of serial number */
/* Request header structure */
struct virtio_blk_req_hdr {
uint32_t type; /* VIRTIO_BLK_T_* */
uint32_t ioprio;
uint64_t sector;
} __packed;
/* 512*virtio_blk_req_hdr.sector byte payload and 1 byte status follows */
#define VIRTIO_BLK_SECTOR_SIZE 512
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