1/* SPDX-License-Identifier: GPL-2.0 */
 2#ifndef __ASM_KASAN_H
 3#define __ASM_KASAN_H
 4
 5#ifndef __ASSEMBLY__
 6
 7#ifdef CONFIG_KASAN
 8
 9#include <linux/linkage.h>
10#include <asm/memory.h>
11#include <asm/pgtable-types.h>
12
13/*
14 * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
15 * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
16 * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
17 */
18#define KASAN_SHADOW_START      (VA_START)
19#define KASAN_SHADOW_END        (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
20
21/*
22 * This value is used to map an address to the corresponding shadow
23 * address by the following formula:
24 *     shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
25 *
26 * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
27 * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
28 * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
29 *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
30 *				(1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
31 */
32#define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << \
33					(64 - KASAN_SHADOW_SCALE_SHIFT)))
34
35void kasan_init(void);
36void kasan_copy_shadow(pgd_t *pgdir);
37asmlinkage void kasan_early_init(void);
38
39#else
40static inline void kasan_init(void) { }
41static inline void kasan_copy_shadow(pgd_t *pgdir) { }
42#endif
43
44#endif
45#endif