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      1 /* $NetBSD: sgmap.h,v 1.8 2023/12/03 00:49:46 thorpej 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  *
     20  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     21  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     22  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     23  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     24  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     25  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     26  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     27  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     28  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     29  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     30  * POSSIBILITY OF SUCH DAMAGE.
     31  */
     32 
     33 #ifndef	_VAX_SGMAP_H
     34 #define	_VAX_SGMAP_H
     35 
     36 #include <sys/vmem.h>
     37 #include <machine/bus.h>
     38 #include <machine/pte.h>
     39 
     40 /*
     41  * A VAX SGMAP's state information.  Nothing in the sgmap requires
     42  * locking[*], with the exception of the vmem arena, which takes care
     43  * of it on its own.
     44  *
     45  * [*] While the page table is a `global' resource, access to it is
     46  * controlled by the arena; once a region has been allocated from
     47  * the arena, that region is effectively `locked'.
     48  */
     49 struct vax_sgmap {
     50 	vmem_t     *aps_arena;		/* arena to manage sgva space */
     51 	struct pte *aps_pt;		/* page table */
     52 	bus_addr_t aps_sgvabase;	/* base of the sgva space */
     53 	bus_size_t aps_sgvasize;	/* size of the sgva space */
     54 	bus_addr_t aps_pa;		/* Address in region */
     55 	unsigned int aps_flags;		/* flags */
     56 };
     57 
     58 void	vax_sgmap_dmatag_init(bus_dma_tag_t, void *, size_t);
     59 
     60 void	vax_sgmap_init(bus_dma_tag_t, struct vax_sgmap *, const char *,
     61 	    bus_addr_t, bus_size_t, struct pte *, bus_size_t);
     62 
     63 int	vax_sgmap_alloc(bus_dmamap_t, bus_size_t, struct vax_sgmap *, int);
     64 void	vax_sgmap_free(bus_dmamap_t, struct vax_sgmap *);
     65 
     66 int	vax_sgmap_reserve(bus_addr_t, bus_size_t, struct vax_sgmap *);
     67 
     68 int     vax_sgmap_load(bus_dma_tag_t, bus_dmamap_t, void *, bus_size_t,
     69 	    struct proc *, int, struct vax_sgmap *);
     70 
     71 int	vax_sgmap_load_mbuf(bus_dma_tag_t, bus_dmamap_t, struct mbuf *, int,
     72 	    struct vax_sgmap *);
     73 
     74 int     vax_sgmap_load_uio(bus_dma_tag_t, bus_dmamap_t, struct uio *, int,
     75 	    struct vax_sgmap *);
     76 
     77 int	vax_sgmap_load_raw(bus_dma_tag_t, bus_dmamap_t, bus_dma_segment_t *,
     78 	    int, bus_size_t, int, struct vax_sgmap *);
     79 
     80 void	vax_sgmap_unload(bus_dma_tag_t, bus_dmamap_t, struct vax_sgmap *);
     81 
     82 #endif	/* _VAX_SGMAP_H */
     83