LXR linux/arch/x86/include/asm/kasan.h

   1/* SPDX-License-Identifier: GPL-2.0 */
   2#ifndef _ASM_X86_KASAN_H
   3#define _ASM_X86_KASAN_H
   4
   5#include <linux/const.h>
   6#define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
   7#define KASAN_SHADOW_SCALE_SHIFT 3
   8
   9/*
  10 * Compiler uses shadow offset assuming that addresses start
  11 * from 0. Kernel addresses don't start from 0, so shadow
  12 * for kernel really starts from compiler's shadow offset +
  13 * 'kernel address space start' >> KASAN_SHADOW_SCALE_SHIFT
  14 */
  15#define KASAN_SHADOW_START      (KASAN_SHADOW_OFFSET + \
  16                                        ((-1UL << __VIRTUAL_MASK_SHIFT) >> \
  17                                                KASAN_SHADOW_SCALE_SHIFT))
  18/*
  19 * 47 bits for kernel address -> (47 - KASAN_SHADOW_SCALE_SHIFT) bits for shadow
  20 * 56 bits for kernel address -> (56 - KASAN_SHADOW_SCALE_SHIFT) bits for shadow
  21 */
  22#define KASAN_SHADOW_END        (KASAN_SHADOW_START + \
  23                                        (1ULL << (__VIRTUAL_MASK_SHIFT - \
  24                                                  KASAN_SHADOW_SCALE_SHIFT)))
  25
  26#ifndef __ASSEMBLY__
  27
  28#ifdef CONFIG_KASAN
  29void __init kasan_early_init(void);
  30void __init kasan_init(void);
  31#else
  32static inline void kasan_early_init(void) { }
  33static inline void kasan_init(void) { }
  34#endif
  35
  36#endif
  37
  38#endif
  39