LXR linux/arch/arm64/include/asm/kasan.h

   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 + 1/8 of kernel virtual addresses.
  16 */
  17#define KASAN_SHADOW_START      (VA_START)
  18#define KASAN_SHADOW_END        (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
  19
  20/*
  21 * This value is used to map an address to the corresponding shadow
  22 * address by the following formula:
  23 *     shadow_addr = (address >> 3) + KASAN_SHADOW_OFFSET;
  24 *
  25 * (1 << 61) shadow addresses - [KASAN_SHADOW_OFFSET,KASAN_SHADOW_END]
  26 * cover all 64-bits of virtual addresses. So KASAN_SHADOW_OFFSET
  27 * should satisfy the following equation:
  28 *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - (1ULL << 61)
  29 */
  30#define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << (64 - 3)))
  31
  32void kasan_init(void);
  33void kasan_copy_shadow(pgd_t *pgdir);
  34asmlinkage void kasan_early_init(void);
  35
  36#else
  37static inline void kasan_init(void) { }
  38static inline void kasan_copy_shadow(pgd_t *pgdir) { }
  39#endif
  40
  41#endif
  42#endif
  43