/*
   * 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 host
   * (32 bits per set) - Read Only */
  #define VIRTIO_MMIO_HOST_FEATURES	0x010
  
  /* Host features set selector - Write Only */
  #define VIRTIO_MMIO_HOST_FEATURES_SEL	0x014
  
  /* Bitmask of features activated by the guest
   * (32 bits per set) - Write Only */
  #define VIRTIO_MMIO_GUEST_FEATURES	0x020
  
  /* Activated features set selector - Write Only */
  #define VIRTIO_MMIO_GUEST_FEATURES_SEL	0x024
  
  /* Guest's memory page size in bytes - Write Only */
  #define VIRTIO_MMIO_GUEST_PAGE_SIZE	0x028
  
  /* 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
  
  /* 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
  
  /* 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
  
  /* 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