1/* SPDX-License-Identifier: GPL-2.0 */
2#ifndef __ASM_KASAN_H
3#define __ASM_KASAN_H
4
5#ifndef __ASSEMBLY__
6
7#include <linux/linkage.h>
8#include <asm/memory.h>
9#include <asm/mte-kasan.h>
10#include <asm/pgtable-types.h>
11
12#define arch_kasan_set_tag(addr, tag)	__tag_set(addr, tag)
13#define arch_kasan_reset_tag(addr)	__tag_reset(addr)
14#define arch_kasan_get_tag(addr)	__tag_get(addr)
15
16#if defined(CONFIG_KASAN_GENERIC) || defined(CONFIG_KASAN_SW_TAGS)
17
18void kasan_init(void);
19
20/*
21 * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
22 * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
23 * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
24 *
25 * KASAN_SHADOW_OFFSET:
26 * This value is used to map an address to the corresponding shadow
27 * address by the following formula:
28 *     shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
29 *
30 * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
31 * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
32 * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
33 *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
34 *				(1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
35 */
36#define _KASAN_SHADOW_START(va)	(KASAN_SHADOW_END - (1UL << ((va) - KASAN_SHADOW_SCALE_SHIFT)))
37#define KASAN_SHADOW_START      _KASAN_SHADOW_START(vabits_actual)
38
39void kasan_copy_shadow(pgd_t *pgdir);
40asmlinkage void kasan_early_init(void);
41
42#else
43static inline void kasan_init(void) { }
44static inline void kasan_copy_shadow(pgd_t *pgdir) { }
45#endif
46
47#endif
48#endif
49