102 lines
3.7 KiB
C
102 lines
3.7 KiB
C
/* $NetBSD: sgmapvar.h,v 1.3 1997/09/05 02:21:51 thorpej Exp $ */
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#define SGMAP_LOG
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/*-
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* Copyright (c) 1997 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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#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.
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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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/*
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* Cookie used to store SGMAP state for a DMA mapping. We
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* could compute some of this at unload time, but storing it
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* is convenient.
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*/
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struct alpha_sgmap_cookie {
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int apdc_pteidx; /* PTE index */
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int apdc_ptecnt; /* PTE count */
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u_long apdc_sgva; /* allocated sgva */
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bus_size_t apdc_len; /* sgva size */
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int apdc_flags;
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};
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/* apdc_flags */
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#define APDC_HAS_SGMAP 0x01 /* sgva/len are valid */
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#ifdef SGMAP_LOG
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/*
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* Log entry, used for debugging SGMAPs.
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*/
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struct sgmap_log_entry {
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int sl_op; /* op; 1 = load, 0 = unload */
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struct alpha_sgmap *sl_sgmap; /* sgmap for entry */
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void *sl_origbuf; /* original buffer */
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u_long sl_pgoffset; /* page offset of buffer start */
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u_long sl_origlen; /* length of transfer */
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u_long sl_sgva; /* sgva of transfer */
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u_long sl_dmaaddr; /* dma address */
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int sl_ptecnt; /* pte count */
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};
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#endif
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void alpha_sgmap_init __P((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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int alpha_sgmap_alloc __P((bus_dmamap_t, bus_size_t,
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struct alpha_sgmap *, int));
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void alpha_sgmap_free __P((struct alpha_sgmap *,
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struct alpha_sgmap_cookie *));
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