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sgmap.h revision 1.4.108.1 
      1 /* $NetBSD: sgmap.h,v 1.4.108.1 2008/02/18 21:05:15 mjf Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
      9  * NASA Ames Research Center.
     10  *
     11  * Redistribution and use in source and binary forms, with or without
     12  * modification, are permitted provided that the following conditions
     13  * are met:
     14  * 1. Redistributions of source code must retain the above copyright
     15  *    notice, this list of conditions and the following disclaimer.
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  * 3. All advertising materials mentioning features or use of this software
     20  *    must display the following acknowledgement:
     21  *	This product includes software developed by the NetBSD
     22  *	Foundation, Inc. and its contributors.
     23  * 4. Neither the name of The NetBSD Foundation nor the names of its
     24  *    contributors may be used to endorse or promote products derived
     25  *    from this software without specific prior written permission.
     26  *
     27  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     28  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     29  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     30  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     31  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     32  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     33  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     34  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     35  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     36  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     37  * POSSIBILITY OF SUCH DAMAGE.
     38  */
     39 
     40 #ifndef	_VAX_SGMAP_H
     41 #define	_VAX_SGMAP_H
     42 
     43 #include <sys/extent.h>
     44 #include <machine/bus.h>
     45 #include <machine/pte.h>
     46 
     47 /*
     48  * A VAX SGMAP's state information.  Nothing in the sgmap requires
     49  * locking[*], with the exception of the extent map.  Locking of the
     50  * extent map is handled within the extent manager itself.
     51  *
     52  * [*] While the page table is a `global' resource, access to it is
     53  * controlled by the extent map; once a region has been allocated from
     54  * the map, that region is effectively `locked'.
     55  */
     56 struct vax_sgmap {
     57 	struct extent *aps_ex;		/* extent map to manage sgva space */
     58 	struct pte *aps_pt;		/* page table */
     59 	bus_addr_t aps_sgvabase;	/* base of the sgva space */
     60 	bus_size_t aps_sgvasize;	/* size of the sgva space */
     61 	bus_addr_t aps_pa;		/* Address in region */
     62 	unsigned int aps_flags;		/* flags */
     63 };
     64 
     65 void	vax_sgmap_dmatag_init(bus_dma_tag_t, void *, size_t);
     66 
     67 void	vax_sgmap_init(bus_dma_tag_t, struct vax_sgmap *, const char *,
     68 	    bus_addr_t, bus_size_t, struct pte *, bus_size_t);
     69 
     70 int	vax_sgmap_alloc(bus_dmamap_t, bus_size_t, struct vax_sgmap *, int);
     71 void	vax_sgmap_free(bus_dmamap_t, struct vax_sgmap *);
     72 
     73 int     vax_sgmap_load(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t,
     74 	    struct proc *, int, struct vax_sgmap *);
     75 
     76 int	vax_sgmap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, struct mbuf *, int,
     77 	    struct vax_sgmap *);
     78 
     79 int     vax_sgmap_load_uio(bus_dma_tag_t, bus_dmamap_t, struct uio *, int,
     80 	    struct vax_sgmap *);
     81 
     82 int	vax_sgmap_load_raw(bus_dma_tag_t, bus_dmamap_t, bus_dma_segment_t *,
     83 	    int, bus_size_t, int, struct vax_sgmap *);
     84 
     85 void	vax_sgmap_unload(bus_dma_tag_t, bus_dmamap_t, struct vax_sgmap *);
     86 
     87 #endif	/* _VAX_SGMAP_H */
     88