1 /* $NetBSD: sgmap_common.c,v 1.3 1997/09/02 13:18:46 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/cdefs.h> /* RCS ID & Copyright macro defns */ 41 42 __KERNEL_RCSID(0, "$NetBSD: sgmap_common.c,v 1.3 1997/09/02 13:18:46 thorpej Exp $"); 43 44 #include <sys/param.h> 45 #include <sys/systm.h> 46 #include <sys/kernel.h> 47 #include <sys/malloc.h> 48 #include <sys/proc.h> 49 50 #include <vm/vm.h> 51 52 #include <machine/bus.h> 53 54 #include <alpha/common/sgmapvar.h> 55 56 void 57 alpha_sgmap_init(t, sgmap, name, wbase, sgvabase, sgvasize, ptesize, ptva) 58 bus_dma_tag_t t; 59 struct alpha_sgmap *sgmap; 60 const char *name; 61 bus_addr_t wbase; 62 bus_addr_t sgvabase; 63 bus_size_t sgvasize; 64 size_t ptesize; 65 void *ptva; 66 { 67 bus_dma_segment_t seg; 68 size_t ptsize; 69 int rseg; 70 71 if (sgvasize & PGOFSET) 72 panic("alpha_sgmap_init: size botch"); 73 74 sgmap->aps_wbase = wbase; 75 sgmap->aps_sgvabase = sgvabase; 76 sgmap->aps_sgvasize = sgvasize; 77 78 if (ptva != NULL) { 79 /* 80 * We already have a page table; this may be a system 81 * where the page table resides in bridge-resident SRAM. 82 */ 83 sgmap->aps_pt = ptva; 84 sgmap->aps_ptpa = 0; 85 } else { 86 /* 87 * Compute the page table size and allocate it. It must 88 * be aligned to its size. 89 */ 90 ptsize = (sgvasize / NBPG) * ptesize; 91 if (bus_dmamem_alloc(t, ptsize, ptsize, 0, &seg, 1, &rseg, 92 BUS_DMA_NOWAIT)) 93 panic("alpha_sgmap_init: can't allocate page table"); 94 if (bus_dmamem_map(t, &seg, rseg, ptsize, 95 (caddr_t *)&sgmap->aps_pt, BUS_DMA_NOWAIT)) 96 panic("alpha_sgmap_init: can't map page table"); 97 sgmap->aps_ptpa = seg.ds_addr; 98 } 99 100 /* 101 * Create the extent map used to manage the virtual address 102 * space. 103 */ 104 sgmap->aps_ex = extent_create((char *)name, sgvabase, sgvasize - 1, 105 M_DEVBUF, NULL, 0, EX_NOWAIT|EX_NOCOALESCE); 106 if (sgmap->aps_ex == NULL) 107 panic("alpha_sgmap_init: can't create extent map"); 108 } 109 110 int 111 alpha_sgmap_alloc(map, len, sgmap, flags) 112 bus_dmamap_t map; 113 bus_size_t len; 114 struct alpha_sgmap *sgmap; 115 int flags; 116 { 117 struct alpha_sgmap_cookie *a = map->_dm_sgcookie; 118 int error; 119 120 #ifdef DIAGNOSTIC 121 if (a->apdc_flags & APDC_HAS_SGMAP) 122 panic("alpha_sgmap_alloc: already have sgva space"); 123 #endif 124 125 a->apdc_len = round_page(len); 126 error = extent_alloc(sgmap->aps_ex, a->apdc_len, NBPG, 127 map->_dm_boundary, (flags & BUS_DMA_NOWAIT) ? EX_NOWAIT : 128 EX_WAITOK, &a->apdc_sgva); 129 130 if (error == 0) 131 a->apdc_flags |= APDC_HAS_SGMAP; 132 else 133 a->apdc_flags &= ~APDC_HAS_SGMAP; 134 135 return (error); 136 } 137 138 void 139 alpha_sgmap_free(sgmap, a) 140 struct alpha_sgmap *sgmap; 141 struct alpha_sgmap_cookie *a; 142 { 143 144 #ifdef DIAGNOSTIC 145 if ((a->apdc_flags & APDC_HAS_SGMAP) == 0) 146 panic("alpha_sgmap_free: no sgva space to free"); 147 #endif 148 149 if (extent_free(sgmap->aps_ex, a->apdc_sgva, 150 a->apdc_len, EX_NOWAIT)) 151 panic("alpha_sgmap_free"); 152 153 a->apdc_flags &= ~APDC_HAS_SGMAP; 154 } 155