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 | |
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 |
71 | io_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 | |
108 | vm_offset_t |
109 | io_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 | |