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 [email protected]
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_xnu.h>
61 #include <vm/vm_map_xnu.h>
62 #include <i386/pmap.h>
63 #include <san/kasan.h>
64
65 extern vm_offset_t virtual_avail;
66
67 #define IO_MAP_SIZE (32ul << 20)
68
69 __startup_data static struct mach_vm_range io_range;
70 static SECURITY_READ_ONLY_LATE(vm_map_t) io_submap;
71 KMEM_RANGE_REGISTER_STATIC(io_submap, &io_range, IO_MAP_SIZE);
72
73 __startup_func
74 static void
io_map_init(void)75 io_map_init(void)
76 {
77 vm_map_will_allocate_early_map(&io_submap);
78 io_submap = kmem_suballoc(kernel_map, &io_range.min_address, IO_MAP_SIZE,
79 VM_MAP_CREATE_NEVER_FAULTS | VM_MAP_CREATE_DISABLE_HOLELIST,
80 VM_FLAGS_FIXED | VM_FLAGS_OVERWRITE, KMS_PERMANENT | KMS_NOFAIL,
81 VM_KERN_MEMORY_IOKIT).kmr_submap;
82 }
83 STARTUP(KMEM, STARTUP_RANK_LAST, io_map_init);
84
85 /*
86 * Allocate and map memory for devices that may need to be mapped before
87 * Mach VM is running.
88 */
89 vm_offset_t
io_map(vm_map_offset_t phys_addr,vm_size_t size,unsigned int flags,vm_prot_t prot,bool unmappable)90 io_map(
91 vm_map_offset_t phys_addr,
92 vm_size_t size,
93 unsigned int flags,
94 vm_prot_t prot,
95 bool unmappable)
96 {
97 vm_offset_t start_offset = phys_addr - trunc_page(phys_addr);
98 vm_offset_t alloc_size = round_page(size + start_offset);
99 vm_offset_t start;
100
101 phys_addr = trunc_page(phys_addr);
102
103 if (startup_phase < STARTUP_SUB_KMEM) {
104 /*
105 * VM is not initialized. Grab memory.
106 */
107 start = virtual_avail;
108 virtual_avail += round_page(size);
109
110 pmap_map_bd(start, phys_addr, phys_addr + alloc_size, prot, flags);
111 #if KASAN
112 kasan_notify_address(start, size);
113 #endif
114 } else {
115 kma_flags_t kmaflags = KMA_NOFAIL | KMA_PAGEABLE;
116
117 if (unmappable) {
118 kmaflags |= KMA_DATA;
119 } else {
120 kmaflags |= KMA_PERMANENT;
121 }
122
123 kmem_alloc(unmappable ? kernel_map : io_submap,
124 &start, alloc_size, kmaflags, VM_KERN_MEMORY_IOKIT);
125 pmap_map(start, phys_addr, phys_addr + alloc_size, prot, flags);
126 }
127 return start + start_offset;
128 }
129