153 lines
6.0 KiB
C
153 lines
6.0 KiB
C
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/* $NetBSD: virtioreg.h,v 1.1 2011/10/30 12:12:21 hannken Exp $ */
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/*
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* Copyright (c) 2010 Minoura Makoto.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* Part of the file derived from `Virtio PCI Card Specification v0.8.6 DRAFT'
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* Appendix A.
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*/
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/* An interface for efficient virtio implementation.
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*
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* This header is BSD licensed so anyone can use the definitions
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* to implement compatible drivers/servers.
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*
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* Copyright 2007, 2009, IBM Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of IBM nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL IBM OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef _DEV_PCI_VIRTIOREG_H_
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#define _DEV_PCI_VIRTIOREG_H_
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#include <sys/types.h>
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/* Virtio product id (subsystem) */
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#define PCI_PRODUCT_VIRTIO_NETWORK 1
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#define PCI_PRODUCT_VIRTIO_BLOCK 2
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#define PCI_PRODUCT_VIRTIO_CONSOLE 3
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#define PCI_PRODUCT_VIRTIO_ENTROPY 4
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#define PCI_PRODUCT_VIRTIO_BALLOON 5
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#define PCI_PRODUCT_VIRTIO_9P 9
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/* Virtio header */
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#define VIRTIO_CONFIG_DEVICE_FEATURES 0 /* 32bit */
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#define VIRTIO_CONFIG_GUEST_FEATURES 4 /* 32bit */
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#define VIRTIO_F_NOTIFY_ON_EMPTY (1<<24)
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#define VIRTIO_F_RING_INDIRECT_DESC (1<<28)
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#define VIRTIO_F_BAD_FEATURE (1<<30)
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#define VIRTIO_CONFIG_QUEUE_ADDRESS 8 /* 32bit */
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#define VIRTIO_CONFIG_QUEUE_SIZE 12 /* 16bit */
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#define VIRTIO_CONFIG_QUEUE_SELECT 14 /* 16bit */
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#define VIRTIO_CONFIG_QUEUE_NOTIFY 16 /* 16bit */
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#define VIRTIO_CONFIG_DEVICE_STATUS 18 /* 8bit */
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#define VIRTIO_CONFIG_DEVICE_STATUS_RESET 0
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#define VIRTIO_CONFIG_DEVICE_STATUS_ACK 1
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#define VIRTIO_CONFIG_DEVICE_STATUS_DRIVER 2
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#define VIRTIO_CONFIG_DEVICE_STATUS_DRIVER_OK 4
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#define VIRTIO_CONFIG_DEVICE_STATUS_FAILED 128
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#define VIRTIO_CONFIG_ISR_STATUS 19 /* 8bit */
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#define VIRTIO_CONFIG_ISR_CONFIG_CHANGE 2
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#define VIRTIO_CONFIG_CONFIG_VECTOR 20 /* 16bit, optional */
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#define VIRTIO_CONFIG_DEVICE_CONFIG_NOMSI 20
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#define VIRTIO_CONFIG_DEVICE_CONFIG_MSI 22
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/* Virtqueue */
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/* This marks a buffer as continuing via the next field. */
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#define VRING_DESC_F_NEXT 1
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/* This marks a buffer as write-only (otherwise read-only). */
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#define VRING_DESC_F_WRITE 2
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/* This means the buffer contains a list of buffer descriptors. */
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#define VRING_DESC_F_INDIRECT 4
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/* The Host uses this in used->flags to advise the Guest: don't kick me
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* when you add a buffer. It's unreliable, so it's simply an
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* optimization. Guest will still kick if it's out of buffers. */
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#define VRING_USED_F_NO_NOTIFY 1
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/* The Guest uses this in avail->flags to advise the Host: don't
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* interrupt me when you consume a buffer. It's unreliable, so it's
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* simply an optimization. */
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#define VRING_AVAIL_F_NO_INTERRUPT 1
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/* Virtio ring descriptors: 16 bytes.
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* These can chain together via "next". */
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struct vring_desc {
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/* Address (guest-physical). */
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uint64_t addr;
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/* Length. */
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uint32_t len;
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/* The flags as indicated above. */
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uint16_t flags;
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/* We chain unused descriptors via this, too */
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uint16_t next;
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} __packed;
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struct vring_avail {
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uint16_t flags;
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uint16_t idx;
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uint16_t ring[0];
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} __packed;
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/* u32 is used here for ids for padding reasons. */
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struct vring_used_elem {
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/* Index of start of used descriptor chain. */
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uint32_t id;
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/* Total length of the descriptor chain which was written to. */
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uint32_t len;
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} __packed;
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struct vring_used {
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uint16_t flags;
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uint16_t idx;
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struct vring_used_elem ring[0];
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} __packed;
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#define VIRTIO_PAGE_SIZE (4096)
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#endif /* _DEV_PCI_VIRTIOREG_H_ */
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