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      1 /*	$NetBSD: alpha_pci_mem.c,v 1.5 2008/04/28 20:22:55 martin 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 PCI/EISA/ISA memory space.  This is currently used
     34  * to provide such support for XFree86.  In a perfect world, this would go
     35  * away in favor of a real bus space mapping framework.
     36  */
     37 
     38 #include <sys/param.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 struct alpha_bus_window *alpha_pci_mem_windows;
     50 int alpha_pci_mem_window_count;
     51 
     52 void *
     53 alpha_pci_mem_map(bus_addr_t memaddr, bus_size_t memsize, int flags,
     54     struct alpha_bus_space_translation *rabst)
     55 {
     56 	struct alpha_bus_window *abw;
     57 	void *addr;
     58 	int prefetchable = flags & BUS_SPACE_MAP_PREFETCHABLE;
     59 	int linear = flags & BUS_SPACE_MAP_LINEAR;
     60 	bus_size_t offset;
     61 	int i, fd;
     62 
     63 	/*
     64 	 * Can't have linear without prefetchable.
     65 	 */
     66 	if (linear && !prefetchable)
     67 		return (MAP_FAILED);
     68 
     69 	if (alpha_pci_mem_windows == NULL) {
     70 		i = alpha_bus_getwindows(ALPHA_BUS_TYPE_PCI_MEM, &abw);
     71 		if (i <= 0)
     72 			return (MAP_FAILED);
     73 
     74 		alpha_pci_mem_windows = abw;
     75 		alpha_pci_mem_window_count = i;
     76 	}
     77 
     78 	for (i = 0; i < alpha_pci_mem_window_count; i++) {
     79 		abw = &alpha_pci_mem_windows[i];
     80 		if (memaddr < abw->abw_abst.abst_bus_start ||
     81 		    (memaddr + (memsize - 1)) > abw->abw_abst.abst_bus_end)
     82 			continue;
     83 
     84 		/*
     85 		 * Prefetchable memory must be mapped in dense space;
     86 		 * otherwise use sparse space.
     87 		 */
     88 		if (prefetchable &&
     89 		    (abw->abw_abst.abst_flags & ABST_DENSE) == 0)
     90 			continue;
     91 		if (!prefetchable &&
     92 		    (abw->abw_abst.abst_flags & ABST_DENSE) != 0)
     93 			continue;
     94 
     95 		/* Looks like we have a winner! */
     96 		goto found;
     97 	}
     98 
     99 	/* Not found in any of the windows. */
    100 	return (MAP_FAILED);
    101 
    102  found:
    103 	fd = open(_PATH_MEM, O_RDWR, 0600);
    104 	if (fd == -1)
    105 		return (MAP_FAILED);
    106 
    107 	if (prefetchable)
    108 		abw->abw_abst.abst_addr_shift = 0;
    109 	memsize <<= abw->abw_abst.abst_addr_shift;
    110 	offset = (memaddr - abw->abw_abst.abst_bus_start) <<
    111 	    abw->abw_abst.abst_addr_shift;
    112 
    113 	addr = mmap(NULL, memsize, PROT_READ|PROT_WRITE, MAP_FILE|MAP_SHARED,
    114 	    fd, (off_t) (abw->abw_abst.abst_sys_start + offset));
    115 
    116 	(void) close(fd);
    117 
    118 	if (addr != MAP_FAILED) {
    119 		/*
    120 		 * Make a copy of the space translation so that the caller
    121 		 * can do the correct access.
    122 		 */
    123 		*rabst = abw->abw_abst;
    124 	}
    125 	return (addr);
    126 }
    127 
    128 void
    129 alpha_pci_mem_unmap(struct alpha_bus_space_translation *abst, void *addr,
    130     bus_size_t size)
    131 {
    132 
    133 	(void) munmap(addr, size << abst->abst_addr_shift);
    134 }
    135