1 /* $NetBSD: sgmapvar.h,v 1.2 1997/06/07 05:29:33 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 1997 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 * 3. All advertising materials mentioning features or use of this software 20 * must display the following acknowledgement: 21 * This product includes software developed by the NetBSD 22 * Foundation, Inc. and its contributors. 23 * 4. Neither the name of The NetBSD Foundation nor the names of its 24 * contributors may be used to endorse or promote products derived 25 * from this software without specific prior written permission. 26 * 27 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 28 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 29 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 30 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 31 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 32 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 33 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 34 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 35 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 36 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 37 * POSSIBILITY OF SUCH DAMAGE. 38 */ 39 40 #include <sys/extent.h> 41 #include <machine/bus.h> 42 43 /* 44 * Bits n:13 of the DMA address are the index of the PTE into 45 * the SGMAP page table. 46 */ 47 #define SGMAP_ADDR_PTEIDX_SHIFT 13 48 49 /* 50 * An Alpha SGMAP's state information. 51 */ 52 struct alpha_sgmap { 53 struct extent *aps_ex; /* extent map to manage sgva space */ 54 void *aps_pt; /* page table */ 55 bus_addr_t aps_ptpa; /* page table physical address */ 56 bus_addr_t aps_sgvabase; /* base of the sgva space */ 57 bus_size_t aps_sgvasize; /* size of the sgva space */ 58 bus_addr_t aps_wbase; /* base of the dma window */ 59 }; 60 61 /* 62 * Cookie used to store SGMAP state for a DMA mapping. We 63 * could compute some of this at unload time, but storing it 64 * is convenient. 65 */ 66 struct alpha_sgmap_cookie { 67 int apdc_pteidx; /* PTE index */ 68 int apdc_ptecnt; /* PTE count */ 69 u_long apdc_sgva; /* allocated sgva */ 70 bus_size_t apdc_len; /* sgva size */ 71 int apdc_flags; 72 }; 73 74 /* apdc_flags */ 75 #define APDC_HAS_SGMAP 0x01 /* sgva/len are valid */ 76 77 void alpha_sgmap_init __P((bus_dma_tag_t, struct alpha_sgmap *, 78 const char *, bus_addr_t, bus_addr_t, bus_size_t, size_t, void *)); 79 80 int alpha_sgmap_alloc __P((bus_dmamap_t, bus_size_t, 81 struct alpha_sgmap *, int)); 82 void alpha_sgmap_free __P((struct alpha_sgmap *, 83 struct alpha_sgmap_cookie *)); 84