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 #include <linux/linkage.h>
   8 #include <asm/memory.h>
   9 #include <asm/pgtable-types.h>
  10
  11 #define arch_kasan_set_tag(addr, tag)   __tag_set(addr, tag)
  12 #define arch_kasan_reset_tag(addr)      __tag_reset(addr)
  13 #define arch_kasan_get_tag(addr)        __tag_get(addr)
  14
  15 #ifdef CONFIG_KASAN
  16
  17 /*
  18  * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
  19  * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
  20  * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
  21  */
  22 #define KASAN_SHADOW_START      (VA_START)
  23 #define KASAN_SHADOW_END        (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
  24
  25 /*
  26  * This value is used to map an address to the corresponding shadow
  27  * address by the following formula:
  28  *     shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
  29  *
  30  * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
  31  * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
  32  * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
  33  *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
  34  *                              (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
  35  */
  36 #define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << \
  37                                         (64 - KASAN_SHADOW_SCALE_SHIFT)))
  38
  39 void kasan_init(void);
  40 void kasan_copy_shadow(pgd_t *pgdir);
  41 asmlinkage void kasan_early_init(void);
  42
  43 #else
  44 static inline void kasan_init(void) { }
  45 static inline void kasan_copy_shadow(pgd_t *pgdir) { }
  46 #endif
  47
  48 #endif
  49 #endif