1 /* $NetBSD: alpha_bus_window.c,v 1.2 2001/07/17 17:46:42 thorpej 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 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 /* 40 * Support for mapping Alpha bus windows. This is currently used to 41 * provide bus space mapping support for XFree86. In a perfect world, 42 * this would go away in favor of a real bus space mapping framework. 43 */ 44 45 #include <sys/types.h> 46 #include <sys/mman.h> 47 48 #include <machine/sysarch.h> 49 50 #include <fcntl.h> 51 #include <paths.h> 52 #include <stdlib.h> 53 #include <string.h> 54 #include <unistd.h> 55 56 int 57 alpha_bus_getwindows(int type, struct alpha_bus_window **abwp) 58 { 59 struct alpha_bus_get_window_count_args count_args; 60 struct alpha_bus_get_window_args window_args; 61 struct alpha_bus_window *abw; 62 int i; 63 64 count_args.type = type; 65 if (sysarch(ALPHA_BUS_GET_WINDOW_COUNT, &count_args) != 0) 66 return (-1); 67 68 abw = malloc(sizeof(*abw) * count_args.count); 69 if (abw == NULL) 70 return (-1); 71 memset(abw, 0, sizeof(*abw) * count_args.count); 72 73 for (i = 0; i < count_args.count; i++) { 74 window_args.type = type; 75 window_args.window = i; 76 window_args.translation = &abw[i].abw_abst; 77 if (sysarch(ALPHA_BUS_GET_WINDOW, &window_args) != 0) { 78 free(abw); 79 return (-1); 80 } 81 } 82 83 *abwp = abw; 84 return (count_args.count); 85 } 86 87 int 88 alpha_bus_mapwindow(struct alpha_bus_window *abw) 89 { 90 struct alpha_bus_space_translation *abst = &abw->abw_abst; 91 void *addr; 92 size_t size; 93 int fd; 94 95 fd = open(_PATH_MEM, O_RDWR, 0600); 96 if (fd == -1) 97 return (-1); 98 99 size = ((abst->abst_bus_end - abst->abst_bus_start) + 1) << 100 abst->abst_addr_shift; 101 102 addr = mmap(NULL, size, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED, 103 fd, (off_t) abst->abst_sys_start); 104 105 (void) close(fd); 106 107 if (addr == MAP_FAILED) 108 return (-1); 109 110 abw->abw_addr = addr; 111 abw->abw_size = size; 112 113 return (0); 114 } 115 116 void 117 alpha_bus_unmapwindow(struct alpha_bus_window *abw) 118 { 119 120 (void) munmap(abw->abw_addr, abw->abw_size); 121 } 122