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      1 /*	$NetBSD: alpha_bus_window.c,v 1.4 2012/03/22 08:52:22 he Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2000 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.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 /*
     33  * Support for mapping Alpha bus windows.  This is currently used to
     34  * provide bus space mapping support for XFree86.  In a perfect world,
     35  * this would go away in favor of a real bus space mapping framework.
     36  */
     37 
     38 #include <sys/types.h>
     39 #include <sys/mman.h>
     40 
     41 #include <machine/sysarch.h>
     42 
     43 #include <fcntl.h>
     44 #include <paths.h>
     45 #include <stdlib.h>
     46 #include <string.h>
     47 #include <unistd.h>
     48 
     49 int
     50 alpha_bus_getwindows(int type, struct alpha_bus_window **abwp)
     51 {
     52 	struct alpha_bus_get_window_count_args count_args;
     53 	struct alpha_bus_get_window_args window_args;
     54 	struct alpha_bus_window *abw;
     55 	unsigned int i;
     56 
     57 	count_args.type = type;
     58 	if (sysarch(ALPHA_BUS_GET_WINDOW_COUNT, &count_args) != 0)
     59 		return (-1);
     60 
     61 	abw = malloc(sizeof(*abw) * count_args.count);
     62 	if (abw == NULL)
     63 		return (-1);
     64 	memset(abw, 0, sizeof(*abw) * count_args.count);
     65 
     66 	for (i = 0; i < count_args.count; i++) {
     67 		window_args.type = type;
     68 		window_args.window = i;
     69 		window_args.translation = &abw[i].abw_abst;
     70 		if (sysarch(ALPHA_BUS_GET_WINDOW, &window_args) != 0) {
     71 			free(abw);
     72 			return (-1);
     73 		}
     74 	}
     75 
     76 	*abwp = abw;
     77 	return (count_args.count);
     78 }
     79 
     80 int
     81 alpha_bus_mapwindow(struct alpha_bus_window *abw)
     82 {
     83 	struct alpha_bus_space_translation *abst = &abw->abw_abst;
     84 	void *addr;
     85 	size_t size;
     86 	int fd;
     87 
     88 	fd = open(_PATH_MEM, O_RDWR, 0600);
     89 	if (fd == -1)
     90 		return (-1);
     91 
     92 	size = ((abst->abst_bus_end - abst->abst_bus_start) + 1) <<
     93 	    abst->abst_addr_shift;
     94 
     95 	addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
     96 	    fd, (off_t) abst->abst_sys_start);
     97 
     98 	(void) close(fd);
     99 
    100 	if (addr == MAP_FAILED)
    101 		return (-1);
    102 
    103 	abw->abw_addr = addr;
    104 	abw->abw_size = size;
    105 
    106 	return (0);
    107 }
    108 
    109 void
    110 alpha_bus_unmapwindow(struct alpha_bus_window *abw)
    111 {
    112 
    113 	(void) munmap(abw->abw_addr, abw->abw_size);
    114 }
    115