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sgmapvar.h revision 1.2 
      1 /* $NetBSD: sgmapvar.h,v 1.2 1997/06/07 05:29:33 thorpej Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 1997 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 #include <sys/extent.h>
     41 #include <machine/bus.h>
     42 
     43 /*
     44  * Bits n:13 of the DMA address are the index of the PTE into
     45  * the SGMAP page table.
     46  */
     47 #define	SGMAP_ADDR_PTEIDX_SHIFT	13
     48 
     49 /*
     50  * An Alpha SGMAP's state information.
     51  */
     52 struct alpha_sgmap {
     53 	struct extent *aps_ex;		/* extent map to manage sgva space */
     54 	void	*aps_pt;		/* page table */
     55 	bus_addr_t aps_ptpa;		/* page table physical address */
     56 	bus_addr_t aps_sgvabase;	/* base of the sgva space */
     57 	bus_size_t aps_sgvasize;	/* size of the sgva space */
     58 	bus_addr_t aps_wbase;		/* base of the dma window */
     59 };
     60 
     61 /*
     62  * Cookie used to store SGMAP state for a DMA mapping.  We
     63  * could compute some of this at unload time, but storing it
     64  * is convenient.
     65  */
     66 struct alpha_sgmap_cookie {
     67 	int	apdc_pteidx;		/* PTE index */
     68 	int	apdc_ptecnt;		/* PTE count */
     69 	u_long	apdc_sgva;		/* allocated sgva */
     70 	bus_size_t apdc_len;		/* sgva size */
     71 	int	apdc_flags;
     72 };
     73 
     74 /* apdc_flags */
     75 #define	APDC_HAS_SGMAP		0x01	/* sgva/len are valid */
     76 
     77 void	alpha_sgmap_init __P((bus_dma_tag_t, struct alpha_sgmap *,
     78 	    const char *, bus_addr_t, bus_addr_t, bus_size_t, size_t, void *));
     79 
     80 int	alpha_sgmap_alloc __P((bus_dmamap_t, bus_size_t,
     81 	    struct alpha_sgmap *, int));
     82 void	alpha_sgmap_free __P((struct alpha_sgmap *,
     83 	    struct alpha_sgmap_cookie *));
     84