kasan.h

 1/* SPDX-License-Identifier: GPL-2.0 */
 2/* Copyright (C) 2019 Andes Technology Corporation */
 3
 4#ifndef __ASM_KASAN_H
 5#define __ASM_KASAN_H
 6
 7#ifndef __ASSEMBLER__
 8
 9/*
10 * The following comment was copied from arm64:
11 * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
12 * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
13 * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
14 *
15 * KASAN_SHADOW_OFFSET:
16 * This value is used to map an address to the corresponding shadow
17 * address by the following formula:
18 *     shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
19 *
20 * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
21 * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
22 * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
23 *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
24 *                              (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
25 */
26#define KASAN_SHADOW_SCALE_SHIFT	3
27
28#define KASAN_SHADOW_SIZE	(UL(1) << ((VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT))
29/*
30 * Depending on the size of the virtual address space, the region may not be
31 * aligned on PGDIR_SIZE, so force its alignment to ease its population.
32 */
33#define KASAN_SHADOW_START	((KASAN_SHADOW_END - KASAN_SHADOW_SIZE) & PGDIR_MASK)
34#define KASAN_SHADOW_END	MODULES_LOWEST_VADDR
35
36#ifdef CONFIG_KASAN
37#define KASAN_SHADOW_OFFSET	_AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
38
39void kasan_init(void);
40asmlinkage void kasan_early_init(void);
41void kasan_swapper_init(void);
42
43#endif
44#endif
45#endif /* __ASM_KASAN_H */