8617f2c7f5
common routine into the individual load routines, since each load routine needs to muddle with the "internals" of this operation. Add a `prefetch threshold' member to the bus_dma_tag_t, so that eventually we can determine whether or not to allocate a spill page on a per-mapping basis.
82 lines
3.5 KiB
C
82 lines
3.5 KiB
C
/* $NetBSD: sgmapvar.h,v 1.13 2001/07/19 04:27:37 thorpej Exp $ */
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/*-
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* Copyright (c) 1997, 1998, 2001 The NetBSD Foundation, Inc.
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* All rights reserved.
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*
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* This code is derived from software contributed to The NetBSD Foundation
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* by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
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* NASA Ames Research Center.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the NetBSD
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* Foundation, Inc. and its contributors.
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* 4. Neither the name of The NetBSD Foundation nor the names of its
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* contributors may be used to endorse or promote products derived
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* from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
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* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
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* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef _ALPHA_COMMON_SGMAPVAR_H
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#define _ALPHA_COMMON_SGMAPVAR_H
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#include <sys/extent.h>
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#include <machine/bus.h>
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/*
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* Bits n:13 of the DMA address are the index of the PTE into
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* the SGMAP page table.
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*/
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#define SGMAP_ADDR_PTEIDX_SHIFT 13
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/*
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* An Alpha SGMAP's state information. Nothing in the sgmap requires
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* locking[*], with the exception of the extent map. Locking of the
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* extent map is handled within the extent manager itself.
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*
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* [*] While the page table is a `global' resource, access to it is
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* controlled by the extent map; once a region has been allocated from
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* the map, that region is effectively `locked'.
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*/
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struct alpha_sgmap {
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struct extent *aps_ex; /* extent map to manage sgva space */
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void *aps_pt; /* page table */
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bus_addr_t aps_ptpa; /* page table physical address */
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bus_addr_t aps_sgvabase; /* base of the sgva space */
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bus_size_t aps_sgvasize; /* size of the sgva space */
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bus_addr_t aps_wbase; /* base of the dma window */
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};
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extern vaddr_t alpha_sgmap_prefetch_spill_page_va;
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extern bus_addr_t alpha_sgmap_prefetch_spill_page_pa;
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void alpha_sgmap_init(bus_dma_tag_t, struct alpha_sgmap *,
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const char *, bus_addr_t, bus_addr_t, bus_size_t, size_t, void *,
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bus_size_t);
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int alpha_sgmap_dmamap_create(bus_dma_tag_t, bus_size_t, int,
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bus_size_t, bus_size_t, int, bus_dmamap_t *);
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void alpha_sgmap_dmamap_destroy(bus_dma_tag_t, bus_dmamap_t);
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#endif /* _ALPHA_COMMON_SGMAPVAR_H */
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