osfmk/i386/io_map.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * @OSF_COPYRIGHT@
  24  */
  25 /*
  26  * Mach Operating System
  27  * Copyright (c) 1991,1990 Carnegie Mellon University
  28  * All Rights Reserved.
  29  *
  30  * Permission to use, copy, modify and distribute this software and its
  31  * documentation is hereby granted, provided that both the copyright
  32  * notice and this permission notice appear in all copies of the
  33  * software, derivative works or modified versions, and any portions
  34  * thereof, and that both notices appear in supporting documentation.
  35  *
  36  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  37  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  38  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  39  *
  40  * Carnegie Mellon requests users of this software to return to
  41  *
  42  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  43  *  School of Computer Science
  44  *  Carnegie Mellon University
  45  *  Pittsburgh PA 15213-3890
  46  *
  47  * any improvements or extensions that they make and grant Carnegie Mellon
  48  * the rights to redistribute these changes.
  49  */
  50 /*
  51  */
  52
  53 #include <mach/vm_param.h>
  54 #include <vm/vm_kern.h>
  55 #include <vm/vm_map.h>
  56 #include <i386/pmap.h>
  57 #include <i386/io_map_entries.h>
  58
  59 extern vm_offset_t      virtual_avail;
  60
  61 /*
  62  * Allocate and map memory for devices that may need to be mapped before
  63  * Mach VM is running.
  64  */
  65 vm_offset_t
  66 io_map(phys_addr, size)
  67         vm_offset_t     phys_addr;
  68         vm_size_t       size;
  69 {
  70         vm_offset_t     start;
  71
  72         if (kernel_map == VM_MAP_NULL) {
  73             /*
  74              * VM is not initialized.  Grab memory.
  75              */
  76             start = virtual_avail;
  77             virtual_avail += round_page(size);
  78         }
  79         else {
  80             (void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
  81         }
  82         (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
  83                         VM_PROT_READ|VM_PROT_WRITE);
  84         return (start);
  85 }