sys/arch/alpha/common/sgmapvar.h

   1 /* $NetBSD: sgmapvar.h,v 1.14 2003/05/03 18:10:42 wiz Exp $ */
   2
   3 /*-
   4  * Copyright (c) 1997, 1998, 2001 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 _ALPHA_COMMON_SGMAPVAR_H
  34 #define _ALPHA_COMMON_SGMAPVAR_H
  35
  36 #include <sys/extent.h>
  37 #include <machine/bus.h>
  38
  39 /*
  40  * Bits n:13 of the DMA address are the index of the PTE into
  41  * the SGMAP page table.
  42  */
  43 #define SGMAP_ADDR_PTEIDX_SHIFT 13
  44
  45 /*
  46  * An Alpha SGMAP's state information.  Nothing in the sgmap requires
  47  * locking[*], with the exception of the extent map.  Locking of the
  48  * extent map is handled within the extent manager itself.
  49  *
  50  * [*] While the page table is a `global' resource, access to it is
  51  * controlled by the extent map; once a region has been allocated from
  52  * the map, that region is effectively `locked'.
  53  */
  54 struct alpha_sgmap {
  55         struct extent *aps_ex;          /* extent map to manage sgva space */
  56         void    *aps_pt;                /* page table */
  57         bus_addr_t aps_ptpa;            /* page table physical address */
  58         bus_addr_t aps_sgvabase;        /* base of the sgva space */
  59         bus_size_t aps_sgvasize;        /* size of the sgva space */
  60         bus_addr_t aps_wbase;           /* base of the DMA window */
  61 };
  62
  63 extern  vaddr_t alpha_sgmap_prefetch_spill_page_va;
  64 extern  bus_addr_t alpha_sgmap_prefetch_spill_page_pa;
  65
  66 void    alpha_sgmap_init(bus_dma_tag_t, struct alpha_sgmap *,
  67             const char *, bus_addr_t, bus_addr_t, bus_size_t, size_t, void *,
  68             bus_size_t);
  69
  70 int     alpha_sgmap_dmamap_create(bus_dma_tag_t, bus_size_t, int,
  71             bus_size_t, bus_size_t, int, bus_dmamap_t *);
  72 void    alpha_sgmap_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
  73
  74 #endif  /* _ALPHA_COMMON_SGMAPVAR_H */