LXR linux/arch/riscv/include/asm/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 __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) << ((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     (KASAN_SHADOW_END - (1ULL << \
  34                                        (64 - KASAN_SHADOW_SCALE_SHIFT)))
  35
  36void kasan_init(void);
  37asmlinkage void kasan_early_init(void);
  38
  39#endif
  40#endif
  41#endif /* __ASM_KASAN_H */
  42