1/*-
2 * SPDX-License-Identifier: BSD-2-Clause
3 *
4 * Copyright (c) 2020 The FreeBSD Foundation
5 *
6 * This software was developed by Mark Johnston under sponsorship from the
7 * FreeBSD Foundation.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions are
11 * met:
12 * 1. Redistributions of source code must retain the above copyright
13 *    notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 *    notice, this list of conditions and the following disclaimer in
16 *    the documentation and/or other materials provided with the distribution.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
21 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
28 * SUCH DAMAGE.
29 */
30
31#ifndef _MACHINE_ASAN_H_
32#define	_MACHINE_ASAN_H_
33
34#ifdef KASAN
35
36#include <vm/vm.h>
37#include <vm/pmap.h>
38#include <vm/vm_page.h>
39#include <machine/vmparam.h>
40
41static inline vm_offset_t
42kasan_md_addr_to_shad(vm_offset_t addr)
43{
44	return (((addr - VM_MIN_KERNEL_ADDRESS) >> KASAN_SHADOW_SCALE_SHIFT) +
45	    KASAN_MIN_ADDRESS);
46}
47
48static inline bool
49kasan_md_unsupported(vm_offset_t addr)
50{
51	vm_offset_t kernmin;
52
53	/*
54	 * The vm_page array is mapped at the beginning of the kernel map, but
55	 * accesses to the array are not validated for now.  Handle the fact
56	 * that KASAN must validate accesses before the vm_page array is
57	 * initialized.
58	 */
59	kernmin = vm_page_array == NULL ? VM_MIN_KERNEL_ADDRESS :
60	    (vm_offset_t)(vm_page_array + vm_page_array_size);
61	return (addr < kernmin || addr >= VM_MAX_KERNEL_ADDRESS);
62}
63
64static inline void
65kasan_md_init(void)
66{
67}
68
69static inline void
70kasan_md_init_early(vm_offset_t bootstack, size_t size)
71{
72	kasan_shadow_map(bootstack, size);
73}
74
75#endif /* KASAN */
76
77#endif /* !_MACHINE_ASAN_H_ */
78