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| Current File : //usr/include/linux/virtio_mmio.h |
/*
* Virtio platform device driver
*
* Copyright 2011, ARM Ltd.
*
* Based on Virtio PCI driver by Anthony Liguori, copyright IBM Corp. 2007
*
* This header is BSD licensed so anyone can use the definitions to implement
* compatible drivers/servers.
*
* 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.
* 3. Neither the name of IBM nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS ``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 IBM OR CONTRIBUTORS 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.
*/
#ifndef _LINUX_VIRTIO_MMIO_H
#define _LINUX_VIRTIO_MMIO_H
/*
* Control registers
*/
/* Magic value ("virt" string) - Read Only */
#define VIRTIO_MMIO_MAGIC_VALUE 0x000
/* Virtio device version - Read Only */
#define VIRTIO_MMIO_VERSION 0x004
/* Virtio device ID - Read Only */
#define VIRTIO_MMIO_DEVICE_ID 0x008
/* Virtio vendor ID - Read Only */
#define VIRTIO_MMIO_VENDOR_ID 0x00c
/* Bitmask of the features supported by the device (host)
* (32 bits per set) - Read Only */
#define VIRTIO_MMIO_DEVICE_FEATURES 0x010
/* Device (host) features set selector - Write Only */
#define VIRTIO_MMIO_DEVICE_FEATURES_SEL 0x014
/* Bitmask of features activated by the driver (guest)
* (32 bits per set) - Write Only */
#define VIRTIO_MMIO_DRIVER_FEATURES 0x020
/* Activated features set selector - Write Only */
#define VIRTIO_MMIO_DRIVER_FEATURES_SEL 0x024
#ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */
/* Guest's memory page size in bytes - Write Only */
#define VIRTIO_MMIO_GUEST_PAGE_SIZE 0x028
#endif
/* Queue selector - Write Only */
#define VIRTIO_MMIO_QUEUE_SEL 0x030
/* Maximum size of the currently selected queue - Read Only */
#define VIRTIO_MMIO_QUEUE_NUM_MAX 0x034
/* Queue size for the currently selected queue - Write Only */
#define VIRTIO_MMIO_QUEUE_NUM 0x038
#ifndef VIRTIO_MMIO_NO_LEGACY /* LEGACY DEVICES ONLY! */
/* Used Ring alignment for the currently selected queue - Write Only */
#define VIRTIO_MMIO_QUEUE_ALIGN 0x03c
/* Guest's PFN for the currently selected queue - Read Write */
#define VIRTIO_MMIO_QUEUE_PFN 0x040
#endif
/* Ready bit for the currently selected queue - Read Write */
#define VIRTIO_MMIO_QUEUE_READY 0x044
/* Queue notifier - Write Only */
#define VIRTIO_MMIO_QUEUE_NOTIFY 0x050
/* Interrupt status - Read Only */
#define VIRTIO_MMIO_INTERRUPT_STATUS 0x060
/* Interrupt acknowledge - Write Only */
#define VIRTIO_MMIO_INTERRUPT_ACK 0x064
/* Device status register - Read Write */
#define VIRTIO_MMIO_STATUS 0x070
/* Selected queue's Descriptor Table address, 64 bits in two halves */
#define VIRTIO_MMIO_QUEUE_DESC_LOW 0x080
#define VIRTIO_MMIO_QUEUE_DESC_HIGH 0x084
/* Selected queue's Available Ring address, 64 bits in two halves */
#define VIRTIO_MMIO_QUEUE_AVAIL_LOW 0x090
#define VIRTIO_MMIO_QUEUE_AVAIL_HIGH 0x094
/* Selected queue's Used Ring address, 64 bits in two halves */
#define VIRTIO_MMIO_QUEUE_USED_LOW 0x0a0
#define VIRTIO_MMIO_QUEUE_USED_HIGH 0x0a4
/* Shared memory region id */
#define VIRTIO_MMIO_SHM_SEL 0x0ac
/* Shared memory region length, 64 bits in two halves */
#define VIRTIO_MMIO_SHM_LEN_LOW 0x0b0
#define VIRTIO_MMIO_SHM_LEN_HIGH 0x0b4
/* Shared memory region base address, 64 bits in two halves */
#define VIRTIO_MMIO_SHM_BASE_LOW 0x0b8
#define VIRTIO_MMIO_SHM_BASE_HIGH 0x0bc
/* Configuration atomicity value */
#define VIRTIO_MMIO_CONFIG_GENERATION 0x0fc
/* The config space is defined by each driver as
* the per-driver configuration space - Read Write */
#define VIRTIO_MMIO_CONFIG 0x100
/*
* Interrupt flags (re: interrupt status & acknowledge registers)
*/
#define VIRTIO_MMIO_INT_VRING (1 << 0)
#define VIRTIO_MMIO_INT_CONFIG (1 << 1)
#endif