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      1 /* $NetBSD: sgmapvar.h,v 1.19 2020/09/05 04:11:10 maya 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/bus.h>
     37 #include <sys/vmem.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 vmem arena, which takes care
     48  * of it on its own.
     49  *
     50  * [*] While the page table is a `global' resource, access to it is
     51  * controlled by the arena; once a region has been allocated from
     52  * the arena, that region is effectively `locked'.
     53  */
     54 struct alpha_sgmap {
     55 	vmem_t	*aps_arena;		/* arena 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 */
     75