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