osfmk/i386/io_map.c

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