osfmk/i386/io_map.c

   1 /*
   2  * Copyright (c) 2000 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_OSREFERENCE_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.  The rights granted to you under the
  10  * License may not be used to create, or enable the creation or
  11  * redistribution of, unlawful or unlicensed copies of an Apple operating
  12  * system, or to circumvent, violate, or enable the circumvention or
  13  * violation of, any terms of an Apple operating system software license
  14  * agreement.
  15  *
  16  * Please obtain a copy of the License at
  17  * http://www.opensource.apple.com/apsl/ and read it before using this
  18  * file.
  19  *
  20  * The Original Code and all software distributed under the License are
  21  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  22  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  23  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  24  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  25  * Please see the License for the specific language governing rights and
  26  * limitations under the License.
  27  *
  28  * @APPLE_LICENSE_OSREFERENCE_HEADER_END@
  29  */
  30 /*
  31  * @OSF_COPYRIGHT@
  32  */
  33 /*
  34  * Mach Operating System
  35  * Copyright (c) 1991,1990 Carnegie Mellon University
  36  * All Rights Reserved.
  37  *
  38  * Permission to use, copy, modify and distribute this software and its
  39  * documentation is hereby granted, provided that both the copyright
  40  * notice and this permission notice appear in all copies of the
  41  * software, derivative works or modified versions, and any portions
  42  * thereof, and that both notices appear in supporting documentation.
  43  *
  44  * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS"
  45  * CONDITION.  CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR
  46  * ANY DAMAGES WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
  47  *
  48  * Carnegie Mellon requests users of this software to return to
  49  *
  50  *  Software Distribution Coordinator  or  Software.Distribution@CS.CMU.EDU
  51  *  School of Computer Science
  52  *  Carnegie Mellon University
  53  *  Pittsburgh PA 15213-3890
  54  *
  55  * any improvements or extensions that they make and grant Carnegie Mellon
  56  * the rights to redistribute these changes.
  57  */
  58 /*
  59  */
  60
  61 #include <mach/vm_param.h>
  62 #include <vm/vm_kern.h>
  63 #include <vm/vm_map.h>
  64 #include <i386/pmap.h>
  65 #include <i386/io_map_entries.h>
  66
  67 extern vm_offset_t      virtual_avail;
  68
  69 /*
  70  * Allocate and map memory for devices that may need to be mapped before
  71  * Mach VM is running.
  72  */
  73 vm_offset_t
  74 io_map(phys_addr, size)
  75         vm_offset_t     phys_addr;
  76         vm_size_t       size;
  77 {
  78         vm_offset_t     start;
  79
  80         if (kernel_map == VM_MAP_NULL) {
  81             /*
  82              * VM is not initialized.  Grab memory.
  83              */
  84             start = virtual_avail;
  85             virtual_avail += round_page(size);
  86
  87             (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
  88                                VM_PROT_READ|VM_PROT_WRITE);
  89         }
  90         else {
  91             (void) kmem_alloc_pageable(kernel_map, &start, round_page(size));
  92             (void) pmap_map(start, phys_addr, phys_addr + round_page(size),
  93                             VM_PROT_READ|VM_PROT_WRITE);
  94         }
  95         return (start);
  96 }
  97
  98 /* just wrap this since io_map handles it */
  99
 100 vm_offset_t io_map_spec(vm_offset_t phys_addr, vm_size_t size)
 101 {
 102   return (io_map(phys_addr, size));
 103 }