1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (C) 2019 Andes Technology Corporation */
12 * The following comment was copied from arm64:
13 * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
14 * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
15 * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
17 * KASAN_SHADOW_OFFSET:
18 * This value is used to map an address to the corresponding shadow
19 * address by the following formula:
20 * shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
22 * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
23 * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
24 * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
25 * KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
26 * (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
28 #define KASAN_SHADOW_SCALE_SHIFT 3
30 #define KASAN_SHADOW_SIZE (UL(1) << ((CONFIG_VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT))
31 #define KASAN_SHADOW_START KERN_VIRT_START
32 #define KASAN_SHADOW_END (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
33 #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
35 void kasan_init(void);
36 asmlinkage void kasan_early_init(void);
40 #endif /* __ASM_KASAN_H */