FreeBSD/Linux Kernel Cross Reference
sys/x86/x86/bus_machdep.c

     /*-
      * Copyright (c) 2015 Marcel Moolenaar
      * All rights reserved.
      *
      * Redistribution and use in source and binary forms, with or without
      * modification, are permitted provided that the following conditions
      * are met:
      *
      * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __FBSDID("$FreeBSD: releng/10.4/sys/x86/x86/bus_machdep.c 287126 2015-08-25 14:39:40Z marcel $");
    
    #include <sys/param.h>
    #include <sys/systm.h>
    #include <x86/bus.h>
    
    #include <vm/vm.h>
    #include <vm/pmap.h>
    
    /*
     * Implementation of bus_space_map(), which effectively is a thin
     * wrapper around pmap_mapdev() for memory mapped I/O space. It's
     * implemented here and not in <x86/bus.h> to avoid pollution.
     */
    int
    bus_space_map(bus_space_tag_t tag, bus_addr_t addr, bus_size_t size,
        int flags __unused, bus_space_handle_t *bshp)
    {
    
            *bshp = (tag == X86_BUS_SPACE_MEM)
                ? (uintptr_t)pmap_mapdev(addr, size)
                : addr;
            return (0);
    }
    
    void
    bus_space_unmap(bus_space_tag_t tag, bus_space_handle_t bsh, bus_size_t size)
    {
    
            if (tag == X86_BUS_SPACE_MEM)
                    pmap_unmapdev(bsh, size);
    }

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