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
  29 void __init kasan_early_init(void);
  30 void __init kasan_init(void);
  31 #else
  32 static inline void kasan_early_init(void) { }
  33 static inline void kasan_init(void) { }
  34 #endif
  35
  36 #endif
  37
  38 #endif