1 /* $NetBSD: sgmap_common.c,v 1.2 1997/06/06 23:58:03 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 <machine/options.h> /* Config options headers */ 41 #include <sys/cdefs.h> /* RCS ID & Copyright macro defns */ 42 43 __KERNEL_RCSID(0, "$NetBSD: sgmap_common.c,v 1.2 1997/06/06 23:58:03 thorpej Exp $"); 44 45 #include <sys/param.h> 46 #include <sys/systm.h> 47 #include <sys/kernel.h> 48 #include <sys/malloc.h> 49 #include <sys/proc.h> 50 51 #include <vm/vm.h> 52 53 #include <machine/bus.h> 54 55 #include <alpha/common/sgmapvar.h> 56 57 void 58 alpha_sgmap_init(t, sgmap, name, wbase, sgvabase, sgvasize, ptesize, ptva) 59 bus_dma_tag_t t; 60 struct alpha_sgmap *sgmap; 61 const char *name; 62 bus_addr_t wbase; 63 bus_addr_t sgvabase; 64 bus_size_t sgvasize; 65 size_t ptesize; 66 void *ptva; 67 { 68 bus_dma_segment_t seg; 69 size_t ptsize; 70 int rseg; 71 72 if (sgvasize & PGOFSET) 73 panic("alpha_sgmap_init: size botch"); 74 75 sgmap->aps_wbase = wbase; 76 sgmap->aps_sgvabase = sgvabase; 77 sgmap->aps_sgvasize = sgvasize; 78 79 if (ptva != NULL) { 80 /* 81 * We already have a page table; this may be a system 82 * where the page table resides in bridge-resident SRAM. 83 */ 84 sgmap->aps_pt = ptva; 85 sgmap->aps_ptpa = 0; 86 } else { 87 /* 88 * Compute the page table size and allocate it. It must 89 * be aligned to its size. 90 */ 91 ptsize = (sgvasize / NBPG) * ptesize; 92 if (bus_dmamem_alloc(t, ptsize, ptsize, 0, &seg, 1, &rseg, 93 BUS_DMA_NOWAIT)) 94 panic("alpha_sgmap_init: can't allocate page table"); 95 if (bus_dmamem_map(t, &seg, rseg, ptsize, 96 (caddr_t *)&sgmap->aps_pt, BUS_DMA_NOWAIT)) 97 panic("alpha_sgmap_init: can't map page table"); 98 sgmap->aps_ptpa = seg.ds_addr; 99 } 100 101 /* 102 * Create the extent map used to manage the virtual address 103 * space. 104 */ 105 sgmap->aps_ex = extent_create((char *)name, sgvabase, sgvasize - 1, 106 M_DEVBUF, NULL, 0, EX_NOWAIT|EX_NOCOALESCE); 107 if (sgmap->aps_ex == NULL) 108 panic("alpha_sgmap_init: can't create extent map"); 109 } 110 111 int 112 alpha_sgmap_alloc(map, len, sgmap, flags) 113 bus_dmamap_t map; 114 bus_size_t len; 115 struct alpha_sgmap *sgmap; 116 int flags; 117 { 118 struct alpha_sgmap_cookie *a = map->_dm_sgcookie; 119 int error; 120 121 #ifdef DIAGNOSTIC 122 if (a->apdc_flags & APDC_HAS_SGMAP) 123 panic("alpha_sgmap_alloc: already have sgva space"); 124 #endif 125 126 a->apdc_len = round_page(len); 127 error = extent_alloc(sgmap->aps_ex, a->apdc_len, NBPG, 128 map->_dm_boundary, (flags & BUS_DMA_NOWAIT) ? EX_NOWAIT : 129 EX_WAITOK, &a->apdc_sgva); 130 131 if (error == 0) 132 a->apdc_flags |= APDC_HAS_SGMAP; 133 else 134 a->apdc_flags &= ~APDC_HAS_SGMAP; 135 136 return (error); 137 } 138 139 void 140 alpha_sgmap_free(sgmap, a) 141 struct alpha_sgmap *sgmap; 142 struct alpha_sgmap_cookie *a; 143 { 144 145 #ifdef DIAGNOSTIC 146 if ((a->apdc_flags & APDC_HAS_SGMAP) == 0) 147 panic("alpha_sgmap_free: no sgva space to free"); 148 #endif 149 150 if (extent_free(sgmap->aps_ex, a->apdc_sgva, 151 a->apdc_len, EX_NOWAIT)) 152 panic("alpha_sgmap_free"); 153 154 a->apdc_flags &= ~APDC_HAS_SGMAP; 155 } 156