FreeBSD/Linux Kernel Cross Reference
sys/osfmk/i386/io_map.c

     /*
      * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
      *
      * @APPLE_LICENSE_HEADER_START@
      * 
      * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
      * 
      * This file contains Original Code and/or Modifications of Original Code
      * as defined in and that are subject to the Apple Public Source License
     * Version 2.0 (the 'License'). You may not use this file except in
     * compliance with the License. Please obtain a copy of the License at
     * http://www.opensource.apple.com/apsl/ and read it before using this
     * file.
     * 
     * The Original Code and all software distributed under the License are
     * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
     * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
     * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
     * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
     * Please see the License for the specific language governing rights and
     * limitations under the License.
     * 
     * @APPLE_LICENSE_HEADER_END@
     */
    /*
     * @OSF_COPYRIGHT@
     */
    /* 
     * Mach Operating System
     * Copyright (c) 1991,1990 Carnegie Mellon University
     * All Rights Reserved.
     * 
     * Permission to use, copy, modify and distribute this software and its
     * documentation is hereby granted, provided that both the copyright
     * notice and this permission notice appear in all copies of the
     * software, derivative works or modified versions, and any portions
     * thereof, and that both notices appear in supporting documentation.
     * 
     * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
     * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
     * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
     * 
     * Carnegie Mellon requests users of this software to return to
     * 
     *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
     *  School of Computer Science
     *  Carnegie Mellon University
     *  Pittsburgh PA 15213-3890
     * 
     * any improvements or extensions that they make and grant Carnegie Mellon
     * the rights to redistribute these changes.
     */
    /*
     */
    
    #include <mach/vm_param.h>
    #include <vm/vm_kern.h>
    #include <vm/vm_map.h>
    #include <i386/pmap.h>
    #include <i386/io_map_entries.h>
    
    extern vm_offset_t      virtual_avail;
    
    /*
     * Allocate and map memory for devices that may need to be mapped before
     * Mach VM is running.
     */
    vm_offset_t
    io_map(phys_addr, size)
            vm_offset_t     phys_addr;
            vm_size_t       size;
    {
            vm_offset_t     start;
    
            if (kernel_map == VM_MAP_NULL) {
                /*
                 * VM is not initialized.  Grab memory.
                 */
                start = virtual_avail;
                virtual_avail += round_page(size);
            }
            else {
                (void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
            }
            (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
                            VM_PROT_READ|VM_PROT_WRITE);
            return (start);
    }
    
    /* just wrap this since io_map handles it */
    
    vm_offset_t io_map_spec(vm_offset_t phys_addr, vm_size_t size)
    {
      return (io_map(phys_addr, size));
    }

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