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