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 35 void kasan_init(void); 36 void kasan_copy_shadow(pgd_t *pgdir); 37 asmlinkage void kasan_early_init(void); 38 39 #else 40 static inline void kasan_init(void) { } 41 static inline void kasan_copy_shadow(pgd_t *pgdir) { } 42 #endif 43 44 #endif 45 #endif 46