122 lines
3.7 KiB
C
122 lines
3.7 KiB
C
/* $NetBSD: alpha_bus_window.c,v 1.2 2001/07/17 17:46:42 thorpej Exp $ */
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/*-
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* Copyright (c) 2000 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.
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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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/*
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* Support for mapping Alpha bus windows. This is currently used to
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* provide bus space mapping support for XFree86. In a perfect world,
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* this would go away in favor of a real bus space mapping framework.
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <machine/sysarch.h>
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#include <fcntl.h>
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#include <paths.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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int
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alpha_bus_getwindows(int type, struct alpha_bus_window **abwp)
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{
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struct alpha_bus_get_window_count_args count_args;
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struct alpha_bus_get_window_args window_args;
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struct alpha_bus_window *abw;
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int i;
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count_args.type = type;
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if (sysarch(ALPHA_BUS_GET_WINDOW_COUNT, &count_args) != 0)
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return (-1);
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abw = malloc(sizeof(*abw) * count_args.count);
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if (abw == NULL)
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return (-1);
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memset(abw, 0, sizeof(*abw) * count_args.count);
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for (i = 0; i < count_args.count; i++) {
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window_args.type = type;
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window_args.window = i;
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window_args.translation = &abw[i].abw_abst;
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if (sysarch(ALPHA_BUS_GET_WINDOW, &window_args) != 0) {
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free(abw);
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return (-1);
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}
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}
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*abwp = abw;
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return (count_args.count);
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}
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int
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alpha_bus_mapwindow(struct alpha_bus_window *abw)
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{
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struct alpha_bus_space_translation *abst = &abw->abw_abst;
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void *addr;
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size_t size;
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int fd;
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fd = open(_PATH_MEM, O_RDWR, 0600);
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if (fd == -1)
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return (-1);
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size = ((abst->abst_bus_end - abst->abst_bus_start) + 1) <<
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abst->abst_addr_shift;
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addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
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fd, (off_t) abst->abst_sys_start);
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(void) close(fd);
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if (addr == MAP_FAILED)
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return (-1);
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abw->abw_addr = addr;
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abw->abw_size = size;
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return (0);
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}
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void
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alpha_bus_unmapwindow(struct alpha_bus_window *abw)
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{
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(void) munmap(abw->abw_addr, abw->abw_size);
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}
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