1/*
2 * Copyright (c) 2007 Apple 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 Copyright (c) 1991,1990 Carnegie Mellon University
33 * All Rights Reserved.
34 *
35 * Permission to use, copy, modify and distribute this software and its
36 * documentation is hereby granted, provided that both the copyright notice
37 * and this permission notice appear in all copies of the software,
38 * derivative works or modified versions, and any portions thereof, and that
39 * both notices appear in supporting documentation.
40 *
41 * CARNEGIE MELLON ALLOWS FREE USE OF THIS SOFTWARE IN ITS "AS IS" CONDITION.
42 * CARNEGIE MELLON DISCLAIMS ANY LIABILITY OF ANY KIND FOR ANY DAMAGES
43 * WHATSOEVER RESULTING FROM THE USE OF THIS SOFTWARE.
44 *
45 * Carnegie Mellon requests users of this software to return to
46 *
47 * Software Distribution Coordinator or Software.Distribution@CS.CMU.EDU
48 * School of Computer Science Carnegie Mellon University Pittsburgh PA
49 * 15213-3890
50 *
51 * any improvements or extensions that they make and grant Carnegie Mellon the
52 * rights to redistribute these changes.
53 */
54/*
55 */
56
57#include <mach/vm_param.h>
58#include <vm/vm_kern.h>
59#include <vm/vm_map.h>
60#include <arm/pmap.h>
61#include <arm/io_map_entries.h>
62#include <san/kasan.h>
63
64extern vm_offset_t virtual_space_start; /* Next available kernel VA */
65
66/*
67 * Allocate and map memory for devices that may need to be mapped before
68 * Mach VM is running.
69 */
70vm_offset_t
71io_map(vm_map_offset_t phys_addr, vm_size_t size, unsigned int flags)
72{
73 vm_offset_t start, start_offset;
74
75 start_offset = phys_addr & PAGE_MASK;
76 size += start_offset;
77 phys_addr -= start_offset;
78
79 if (kernel_map == VM_MAP_NULL) {
80 /*
81 * VM is not initialized. Grab memory.
82 */
83 start = virtual_space_start;
84 virtual_space_start += round_page(size);
85
86 assert(flags == VM_WIMG_WCOMB || flags == VM_WIMG_IO);
87
88 if (flags == VM_WIMG_WCOMB) {
89 (void) pmap_map_bd_with_options(start, phys_addr, phys_addr + round_page(size),
90 VM_PROT_READ | VM_PROT_WRITE, PMAP_MAP_BD_WCOMB);
91 } else {
92 (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
93 VM_PROT_READ | VM_PROT_WRITE);
94 }
95 } else {
96 (void) kmem_alloc_pageable(kernel_map, &start, round_page(size), VM_KERN_MEMORY_IOKIT);
97 (void) pmap_map(start, phys_addr, phys_addr + round_page(size),
98 VM_PROT_READ | VM_PROT_WRITE, flags);
99 }
100#if KASAN
101 kasan_notify_address(start + start_offset, size);
102#endif
103 return (start + start_offset);
104}
105
106/* just wrap this since io_map handles it */
107
108vm_offset_t
109io_map_spec(vm_map_offset_t phys_addr, vm_size_t size, unsigned int flags)
110{
111 return (io_map(phys_addr, size, flags));
112}
113