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 __ASSEMBLY__ 8 9 #ifdef CONFIG_KASAN 10 11 /* 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). 16 * 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 21 * 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)) 27 */ 28 #define KASAN_SHADOW_SCALE_SHIFT 3 29 30 #define KASAN_SHADOW_SIZE (UL(1) << ((VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT)) 31 /* 32 * Depending on the size of the virtual address space, the region may not be 33 * aligned on PGDIR_SIZE, so force its alignment to ease its population. 34 */ 35 #define KASAN_SHADOW_START ((KASAN_SHADOW_END - KASAN_SHADOW_SIZE) & PGDIR_MASK) 36 #define KASAN_SHADOW_END MODULES_LOWEST_VADDR 37 #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL) 38 39 void kasan_init(void); 40 asmlinkage void kasan_early_init(void); 41 void kasan_swapper_init(void); 42 43 #endif 44 #endif 45 #endif /* __ASM_KASAN_H */ 46