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
alpha_bus_getwindows(int type,struct alpha_bus_window ** abwp)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
alpha_bus_mapwindow(struct alpha_bus_window * abw)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
alpha_bus_unmapwindow(struct alpha_bus_window * abw)110 alpha_bus_unmapwindow(struct alpha_bus_window *abw)
111 {
112
113 (void) munmap(abw->abw_addr, abw->abw_size);
114 }
115