osfmk/i386/io_map.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*
  24  * @OSF_COPYRIGHT@
  25  */
  26 /*
  27  * Mach Operating System
  28  * Copyright (c) 1991,1990 Carnegie Mellon University
  29  * All Rights Reserved.
  30  *
  31  * Permission to use, copy, modify and distribute this software and its
  32  * documentation is hereby granted, provided that both the copyright
  33  * notice and this permission notice appear in all copies of the
  34  * software, derivative works or modified versions, and any portions
  35  * thereof, and that both notices appear in supporting documentation.
  36  *
  37  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  38  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  39  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  40  *
  41  * Carnegie Mellon requests users of this software to return to
  42  *
  43  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  44  *  School of Computer Science
  45  *  Carnegie Mellon University
  46  *  Pittsburgh PA 15213-3890
  47  *
  48  * any improvements or extensions that they make and grant Carnegie Mellon
  49  * the rights to redistribute these changes.
  50  */
  51 /*
  52  */
  53
  54 #include <mach/vm_param.h>
  55 #include <vm/vm_kern.h>
  56 #include <vm/vm_map.h>
  57 #include <i386/pmap.h>
  58 #include <i386/io_map_entries.h>
  59
  60 extern vm_offset_t      virtual_avail;
  61
  62 /*
  63  * Allocate and map memory for devices that may need to be mapped before
  64  * Mach VM is running.
  65  */
  66 vm_offset_t
  67 io_map(phys_addr, size)
  68         vm_offset_t     phys_addr;
  69         vm_size_t       size;
  70 {
  71         vm_offset_t     start;
  72
  73         if (kernel_map == VM_MAP_NULL) {
  74             /*
  75              * VM is not initialized.  Grab memory.
  76              */
  77             start = virtual_avail;
  78             virtual_avail += round_page(size);
  79
  80             (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
  81                                VM_PROT_READ|VM_PROT_WRITE);
  82         }
  83         else {
  84             (void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
  85             (void) pmap_map(start, phys_addr, phys_addr + round_page(size),
  86                             VM_PROT_READ|VM_PROT_WRITE);
  87         }
  88         return (start);
  89 }
  90
  91 /* just wrap this since io_map handles it */
  92
  93 vm_offset_t io_map_spec(vm_offset_t phys_addr, vm_size_t size)
  94 {
  95   return (io_map(phys_addr, size));
  96 }