NetBSD/lib/libarch/alpha/alpha_bus_window.c

126 lines
3.7 KiB
C

/* $NetBSD: alpha_bus_window.c,v 1.1 2000/02/26 18:59:36 thorpej Exp $ */
/*-
* Copyright (c) 2000 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Jason R. Thorpe.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the NetBSD
* Foundation, Inc. and its contributors.
* 4. Neither the name of The NetBSD Foundation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
/*
* Support for mapping Alpha bus windows. This is currently used to
* provide bus space mapping support for XFree86. In a perfect world,
* this would go away in favor of a real bus space mapping framework.
*/
#include <sys/types.h>
#include <sys/mman.h>
#include <machine/sysarch.h>
#include <fcntl.h>
#include <paths.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
int
alpha_bus_getwindows(type, abwp)
int type;
struct alpha_bus_window **abwp;
{
struct alpha_bus_get_window_count_args count_args;
struct alpha_bus_get_window_args window_args;
struct alpha_bus_window *abw;
int i;
count_args.type = type;
if (sysarch(ALPHA_BUS_GET_WINDOW_COUNT, &count_args) != 0)
return (-1);
abw = malloc(sizeof(*abw) * count_args.count);
if (abw == NULL)
return (-1);
memset(abw, 0, sizeof(*abw) * count_args.count);
for (i = 0; i < count_args.count; i++) {
window_args.type = type;
window_args.window = i;
window_args.translation = &abw[i].abw_abst;
if (sysarch(ALPHA_BUS_GET_WINDOW, &window_args) != 0) {
free(abw);
return (-1);
}
}
*abwp = abw;
return (count_args.count);
}
int
alpha_bus_mapwindow(abw)
struct alpha_bus_window *abw;
{
struct alpha_bus_space_translation *abst = &abw->abw_abst;
void *addr;
size_t size;
int fd;
fd = open(_PATH_MEM, O_RDWR, 0600);
if (fd == -1)
return (-1);
size = ((abst->abst_bus_end - abst->abst_bus_start) + 1) <<
abst->abst_addr_shift;
addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
fd, (off_t) abst->abst_sys_start);
(void) close(fd);
if (addr == MAP_FAILED)
return (-1);
abw->abw_addr = addr;
abw->abw_size = size;
return (0);
}
void
alpha_bus_unmapwindow(abw)
struct alpha_bus_window *abw;
{
(void) munmap(abw->abw_addr, abw->abw_size);
}