lib/libarch/alpha/alpha_bus_window.c

   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  *
  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         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 }