156 lines
4.7 KiB
C
156 lines
4.7 KiB
C
/* $NetBSD: sgmap_common.c,v 1.2 1997/06/06 23:58:03 thorpej Exp $ */
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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 <machine/options.h> /* Config options headers */
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#include <sys/cdefs.h> /* RCS ID & Copyright macro defns */
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__KERNEL_RCSID(0, "$NetBSD: sgmap_common.c,v 1.2 1997/06/06 23:58:03 thorpej Exp $");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <vm/vm.h>
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#include <machine/bus.h>
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#include <alpha/common/sgmapvar.h>
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void
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alpha_sgmap_init(t, sgmap, name, wbase, sgvabase, sgvasize, ptesize, ptva)
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bus_dma_tag_t t;
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struct alpha_sgmap *sgmap;
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const char *name;
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bus_addr_t wbase;
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bus_addr_t sgvabase;
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bus_size_t sgvasize;
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size_t ptesize;
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void *ptva;
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{
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bus_dma_segment_t seg;
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size_t ptsize;
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int rseg;
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if (sgvasize & PGOFSET)
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panic("alpha_sgmap_init: size botch");
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sgmap->aps_wbase = wbase;
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sgmap->aps_sgvabase = sgvabase;
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sgmap->aps_sgvasize = sgvasize;
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if (ptva != NULL) {
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/*
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* We already have a page table; this may be a system
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* where the page table resides in bridge-resident SRAM.
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*/
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sgmap->aps_pt = ptva;
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sgmap->aps_ptpa = 0;
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} else {
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/*
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* Compute the page table size and allocate it. It must
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* be aligned to its size.
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*/
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ptsize = (sgvasize / NBPG) * ptesize;
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if (bus_dmamem_alloc(t, ptsize, ptsize, 0, &seg, 1, &rseg,
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BUS_DMA_NOWAIT))
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panic("alpha_sgmap_init: can't allocate page table");
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if (bus_dmamem_map(t, &seg, rseg, ptsize,
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(caddr_t *)&sgmap->aps_pt, BUS_DMA_NOWAIT))
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panic("alpha_sgmap_init: can't map page table");
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sgmap->aps_ptpa = seg.ds_addr;
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}
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/*
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* Create the extent map used to manage the virtual address
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* space.
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*/
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sgmap->aps_ex = extent_create((char *)name, sgvabase, sgvasize - 1,
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M_DEVBUF, NULL, 0, EX_NOWAIT|EX_NOCOALESCE);
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if (sgmap->aps_ex == NULL)
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panic("alpha_sgmap_init: can't create extent map");
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}
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int
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alpha_sgmap_alloc(map, len, sgmap, flags)
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bus_dmamap_t map;
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bus_size_t len;
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struct alpha_sgmap *sgmap;
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int flags;
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{
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struct alpha_sgmap_cookie *a = map->_dm_sgcookie;
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int error;
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#ifdef DIAGNOSTIC
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if (a->apdc_flags & APDC_HAS_SGMAP)
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panic("alpha_sgmap_alloc: already have sgva space");
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#endif
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a->apdc_len = round_page(len);
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error = extent_alloc(sgmap->aps_ex, a->apdc_len, NBPG,
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map->_dm_boundary, (flags & BUS_DMA_NOWAIT) ? EX_NOWAIT :
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EX_WAITOK, &a->apdc_sgva);
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if (error == 0)
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a->apdc_flags |= APDC_HAS_SGMAP;
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else
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a->apdc_flags &= ~APDC_HAS_SGMAP;
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return (error);
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}
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void
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alpha_sgmap_free(sgmap, a)
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struct alpha_sgmap *sgmap;
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struct alpha_sgmap_cookie *a;
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{
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#ifdef DIAGNOSTIC
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if ((a->apdc_flags & APDC_HAS_SGMAP) == 0)
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panic("alpha_sgmap_free: no sgva space to free");
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#endif
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if (extent_free(sgmap->aps_ex, a->apdc_sgva,
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a->apdc_len, EX_NOWAIT))
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panic("alpha_sgmap_free");
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a->apdc_flags &= ~APDC_HAS_SGMAP;
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}
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