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
  32 void kasan_init(void);
  33 void kasan_copy_shadow(pgd_t *pgdir);
  34 asmlinkage void kasan_early_init(void);
  35
  36 #else
  37 static inline void kasan_init(void) { }
  38 static inline void kasan_copy_shadow(pgd_t *pgdir) { }
  39 #endif
  40
  41 #endif
  42 #endif