The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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

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    1 /*-
    2  * Copyright 2006 John-Mark Gurney.
    3  * All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  *
   14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
   15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
   18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   24  * SUCH DAMAGE.
   25  *
   26  * $FreeBSD: releng/10.1/sys/sys/_bus_dma.h 161927 2006-09-03 00:26:17Z jmg $
   27  *
   28  */
   29 
   30 #ifndef _SYS__BUS_DMA_H_
   31 #define _SYS__BUS_DMA_H_
   32 
   33 typedef int bus_dmasync_op_t;
   34 
   35 /*
   36  *      bus_dma_tag_t
   37  *
   38  *      A machine-dependent opaque type describing the characteristics
   39  *      of how to perform DMA mappings.  This structure encapsultes
   40  *      information concerning address and alignment restrictions, number
   41  *      of S/G segments, amount of data per S/G segment, etc.
   42  */
   43 typedef struct bus_dma_tag      *bus_dma_tag_t;
   44 
   45 /*
   46  *      bus_dmamap_t
   47  *
   48  *      DMA mapping instance information.
   49  */
   50 typedef struct bus_dmamap       *bus_dmamap_t;
   51 
   52 /*
   53  * A function that performs driver-specific synchronization on behalf of
   54  * busdma.
   55  */
   56 typedef enum {
   57         BUS_DMA_LOCK    = 0x01,
   58         BUS_DMA_UNLOCK  = 0x02,
   59 } bus_dma_lock_op_t;
   60 
   61 typedef void bus_dma_lock_t(void *, bus_dma_lock_op_t);
   62 
   63 #endif /* !_SYS__BUS_DMA_H_ */

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