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 [email protected]
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
64 extern 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 */
70 vm_offset_t
io_map(vm_map_offset_t phys_addr,vm_size_t size,unsigned int flags)71 io_map(vm_map_offset_t phys_addr, vm_size_t size, unsigned int flags)
72 {
73 return io_map_with_prot(phys_addr, size, flags, VM_PROT_READ | VM_PROT_WRITE);
74 }
75
76 /*
77 * Allocate and map memory for devices that may need to be mapped before
78 * Mach VM is running. Allows caller to specify mapping protection
79 */
80 vm_offset_t
io_map_with_prot(vm_map_offset_t phys_addr,vm_size_t size,unsigned int flags,vm_prot_t prot)81 io_map_with_prot(vm_map_offset_t phys_addr, vm_size_t size, unsigned int flags, vm_prot_t prot)
82 {
83 vm_offset_t start, start_offset;
84
85 start_offset = phys_addr & PAGE_MASK;
86 size += start_offset;
87 phys_addr -= start_offset;
88
89 if (kernel_map == VM_MAP_NULL) {
90 /*
91 * VM is not initialized. Grab memory.
92 */
93 start = virtual_space_start;
94 virtual_space_start += round_page(size);
95
96 assert(flags == VM_WIMG_WCOMB || flags == VM_WIMG_IO);
97
98 if (flags == VM_WIMG_WCOMB) {
99 (void) pmap_map_bd_with_options(start, phys_addr, phys_addr + round_page(size),
100 prot, PMAP_MAP_BD_WCOMB);
101 } else {
102 (void) pmap_map_bd(start, phys_addr, phys_addr + round_page(size),
103 prot);
104 }
105 } else {
106 (void) kmem_alloc_pageable(kernel_map, &start, round_page(size), VM_KERN_MEMORY_IOKIT);
107 (void) pmap_map(start, phys_addr, phys_addr + round_page(size),
108 prot, flags);
109 }
110 #if KASAN
111 kasan_notify_address(start + start_offset, size);
112 #endif
113 return start + start_offset;
114 }
115
116 /* just wrap this since io_map handles it */
117
118 vm_offset_t
io_map_spec(vm_map_offset_t phys_addr,vm_size_t size,unsigned int flags)119 io_map_spec(vm_map_offset_t phys_addr, vm_size_t size, unsigned int flags)
120 {
121 return io_map(phys_addr, size, flags);
122 }
123