FreeBSD/Linux Kernel Cross Reference
sys/dev/beri/virtio/virtio.h

     /*-
      * Copyright (c) 2014 Ruslan Bukin <br@bsdpad.com>
      * All rights reserved.
      *
      * This software was developed by SRI International and the University of
      * Cambridge Computer Laboratory under DARPA/AFRL contract (FA8750-10-C-0237)
      * ("CTSRD"), as part of the DARPA CRASH research programme.
      *
      * 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 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 THE AUTHOR 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.
     *
     * $FreeBSD$
     */
    
    #define READ2(_sc, _reg) \
            bus_read_2((_sc)->res[0], _reg)
    #define READ4(_sc, _reg) \
            bus_read_4((_sc)->res[0], _reg)
    #define WRITE2(_sc, _reg, _val) \
            bus_write_2((_sc)->res[0], _reg, _val)
    #define WRITE4(_sc, _reg, _val) \
            bus_write_4((_sc)->res[0], _reg, _val)
    
    #define PAGE_SHIFT              12
    #define VRING_ALIGN             4096
    
    #define VQ_ALLOC                0x01    /* set once we have a pfn */
    #define VQ_MAX_DESCRIPTORS      512
    
    struct vqueue_info {
            uint16_t vq_qsize;      /* size of this queue (a power of 2) */
            uint16_t vq_num;
            uint16_t vq_flags;
            uint16_t vq_last_avail; /* a recent value of vq_avail->va_idx */
            uint16_t vq_save_used;  /* saved vq_used->vu_idx; see vq_endchains */
            uint32_t vq_pfn;        /* PFN of virt queue (not shifted!) */
    
            volatile struct vring_desc *vq_desc;    /* descriptor array */
            volatile struct vring_avail *vq_avail;  /* the "avail" ring */
            volatile struct vring_used *vq_used;    /* the "used" ring */
    };
    
    int vq_ring_ready(struct vqueue_info *vq);
    int vq_has_descs(struct vqueue_info *vq);
    void * paddr_map(uint32_t offset, uint32_t phys, uint32_t size);
    void paddr_unmap(void *phys, uint32_t size);
    int vq_getchain(uint32_t beri_mem_offset, struct vqueue_info *vq,
                    struct iovec *iov, int n_iov, uint16_t *flags);
    void vq_relchain(struct vqueue_info *vq, struct iovec *iov, int n, uint32_t iolen);
    struct iovec * getcopy(struct iovec *iov, int n);
    
    int setup_pio(device_t dev, char *name, device_t *pio_dev);
    int setup_offset(device_t dev, uint32_t *offset);

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