Annotation of sys/arch/alpha/dev/sgmap_common.c, Revision 1.1
1.1 ! nbrk 1: /* $OpenBSD: sgmap_common.c,v 1.9 2006/04/13 14:41:08 brad Exp $ */
! 2: /* $NetBSD: sgmap_common.c,v 1.13 2000/06/29 09:02:57 mrg Exp $ */
! 3:
! 4: /*-
! 5: * Copyright (c) 1997, 1998 The NetBSD Foundation, Inc.
! 6: * All rights reserved.
! 7: *
! 8: * This code is derived from software contributed to The NetBSD Foundation
! 9: * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
! 10: * NASA Ames Research Center.
! 11: *
! 12: * Redistribution and use in source and binary forms, with or without
! 13: * modification, are permitted provided that the following conditions
! 14: * are met:
! 15: * 1. Redistributions of source code must retain the above copyright
! 16: * notice, this list of conditions and the following disclaimer.
! 17: * 2. Redistributions in binary form must reproduce the above copyright
! 18: * notice, this list of conditions and the following disclaimer in the
! 19: * documentation and/or other materials provided with the distribution.
! 20: * 3. All advertising materials mentioning features or use of this software
! 21: * must display the following acknowledgement:
! 22: * This product includes software developed by the NetBSD
! 23: * Foundation, Inc. and its contributors.
! 24: * 4. Neither the name of The NetBSD Foundation nor the names of its
! 25: * contributors may be used to endorse or promote products derived
! 26: * from this software without specific prior written permission.
! 27: *
! 28: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
! 29: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
! 30: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
! 31: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
! 32: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
! 33: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
! 34: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
! 35: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
! 36: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
! 37: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
! 38: * POSSIBILITY OF SUCH DAMAGE.
! 39: */
! 40:
! 41: #define _ALPHA_BUS_DMA_PRIVATE
! 42:
! 43: #include <sys/param.h>
! 44: #include <sys/systm.h>
! 45: #include <sys/kernel.h>
! 46: #include <sys/malloc.h>
! 47: #include <sys/proc.h>
! 48:
! 49: #include <uvm/uvm_extern.h>
! 50:
! 51: #include <machine/bus.h>
! 52:
! 53: #include <alpha/dev/sgmapvar.h>
! 54:
! 55: /*
! 56: * Some systems will prefetch the next page during a memory -> device DMA.
! 57: * This can cause machine checks if there is not a spill page after the
! 58: * last page of the DMA (thus avoiding hitting an invalid SGMAP PTE).
! 59: */
! 60: vaddr_t alpha_sgmap_prefetch_spill_page_va;
! 61: bus_addr_t alpha_sgmap_prefetch_spill_page_pa;
! 62:
! 63: void
! 64: alpha_sgmap_init(t, sgmap, name, wbase, sgvabase, sgvasize, ptesize, ptva,
! 65: minptalign)
! 66: bus_dma_tag_t t;
! 67: struct alpha_sgmap *sgmap;
! 68: const char *name;
! 69: bus_addr_t wbase;
! 70: bus_addr_t sgvabase;
! 71: bus_size_t sgvasize;
! 72: size_t ptesize;
! 73: void *ptva;
! 74: bus_size_t minptalign;
! 75: {
! 76: bus_dma_segment_t seg;
! 77: size_t ptsize;
! 78: int rseg;
! 79:
! 80: if (sgvasize & PGOFSET) {
! 81: printf("size botch for sgmap `%s'\n", name);
! 82: goto die;
! 83: }
! 84:
! 85: sgmap->aps_wbase = wbase;
! 86: sgmap->aps_sgvabase = sgvabase;
! 87: sgmap->aps_sgvasize = sgvasize;
! 88:
! 89: if (ptva != NULL) {
! 90: /*
! 91: * We already have a page table; this may be a system
! 92: * where the page table resides in bridge-resident SRAM.
! 93: */
! 94: sgmap->aps_pt = ptva;
! 95: sgmap->aps_ptpa = 0;
! 96: } else {
! 97: /*
! 98: * Compute the page table size and allocate it. At minimum,
! 99: * this must be aligned to the page table size. However,
! 100: * some platforms have more strict alignment requirements.
! 101: */
! 102: ptsize = (sgvasize / PAGE_SIZE) * ptesize;
! 103: if (minptalign != 0) {
! 104: if (minptalign < ptsize)
! 105: minptalign = ptsize;
! 106: } else
! 107: minptalign = ptsize;
! 108: if (bus_dmamem_alloc(t, ptsize, minptalign, 0, &seg, 1, &rseg,
! 109: BUS_DMA_NOWAIT)) {
! 110: panic("unable to allocate page table for sgmap `%s'",
! 111: name);
! 112: goto die;
! 113: }
! 114: sgmap->aps_ptpa = seg.ds_addr;
! 115: sgmap->aps_pt = (caddr_t)ALPHA_PHYS_TO_K0SEG(sgmap->aps_ptpa);
! 116: }
! 117:
! 118: /*
! 119: * Create the extent map used to manage the virtual address
! 120: * space.
! 121: */
! 122: sgmap->aps_ex = extent_create((char *)name, sgvabase, sgvasize - 1,
! 123: M_DEVBUF, NULL, 0, EX_NOWAIT|EX_NOCOALESCE);
! 124: if (sgmap->aps_ex == NULL) {
! 125: printf("unable to create extent map for sgmap `%s'\n",
! 126: name);
! 127: goto die;
! 128: }
! 129:
! 130: /*
! 131: * Allocate a spill page if that hasn't already been done.
! 132: */
! 133: if (alpha_sgmap_prefetch_spill_page_va == 0) {
! 134: if (bus_dmamem_alloc(t, PAGE_SIZE, 0, 0, &seg, 1, &rseg,
! 135: BUS_DMA_NOWAIT)) {
! 136: printf("unable to allocate spill page for sgmap `%s'\n",
! 137: name);
! 138: goto die;
! 139: }
! 140: alpha_sgmap_prefetch_spill_page_pa = seg.ds_addr;
! 141: alpha_sgmap_prefetch_spill_page_va =
! 142: ALPHA_PHYS_TO_K0SEG(alpha_sgmap_prefetch_spill_page_pa);
! 143: bzero((caddr_t)alpha_sgmap_prefetch_spill_page_va, PAGE_SIZE);
! 144: }
! 145:
! 146: return;
! 147: die:
! 148: panic("alpha_sgmap_init");
! 149: }
! 150:
! 151: int
! 152: alpha_sgmap_dmamap_create(t, size, nsegments, maxsegsz, boundary,
! 153: flags, dmamp)
! 154: bus_dma_tag_t t;
! 155: bus_size_t size;
! 156: int nsegments;
! 157: bus_size_t maxsegsz;
! 158: bus_size_t boundary;
! 159: int flags;
! 160: bus_dmamap_t *dmamp;
! 161: {
! 162: bus_dmamap_t map;
! 163: int error;
! 164:
! 165: error = _bus_dmamap_create(t, size, nsegments, maxsegsz,
! 166: boundary, flags, dmamp);
! 167: if (error)
! 168: return (error);
! 169:
! 170: map = *dmamp;
! 171:
! 172: /* XXX BUS_DMA_ALLOCNOW */
! 173:
! 174: return (error);
! 175: }
! 176:
! 177: void
! 178: alpha_sgmap_dmamap_destroy(t, map)
! 179: bus_dma_tag_t t;
! 180: bus_dmamap_t map;
! 181: {
! 182: KASSERT(map->dm_mapsize == 0);
! 183:
! 184: _bus_dmamap_destroy(t, map);
! 185: }
CVSweb
![[BACK]](/icons/back.gif){kind=icon}
Return to sgmap_common.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [local] / sys / arch / alpha / dev