FreeBSD/Linux Kernel Cross Reference
sys/sys/_bus_dma.h

     /*-
      * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
      *
      * Copyright 2006 John-Mark Gurney.
      * All rights reserved.
      *
      * 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: releng/12.0/sys/sys/_bus_dma.h 326256 2017-11-27 15:01:59Z pfg $
     *
     */
    
    #ifndef _SYS__BUS_DMA_H_
    #define _SYS__BUS_DMA_H_
    
    typedef int bus_dmasync_op_t;
    
    /*
     *      bus_dma_tag_t
     *
     *      A machine-dependent opaque type describing the characteristics
     *      of how to perform DMA mappings.  This structure encapsultes
     *      information concerning address and alignment restrictions, number
     *      of S/G segments, amount of data per S/G segment, etc.
     */
    typedef struct bus_dma_tag      *bus_dma_tag_t;
    
    /*
     *      bus_dmamap_t
     *
     *      DMA mapping instance information.
     */
    typedef struct bus_dmamap       *bus_dmamap_t;
    
    /*
     * A function that performs driver-specific synchronization on behalf of
     * busdma.
     */
    typedef enum {
            BUS_DMA_LOCK    = 0x01,
            BUS_DMA_UNLOCK  = 0x02,
    } bus_dma_lock_op_t;
    
    typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
    
    #endif /* !_SYS__BUS_DMA_H_ */

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