arch/arm64/include/asm/kasan.h

   1 #ifndef __ASM_KASAN_H
   2 #define __ASM_KASAN_H
   3
   4 #ifndef __ASSEMBLY__
   5
   6 #ifdef CONFIG_KASAN
   7
   8 #include <linux/linkage.h>
   9 #include <asm/memory.h>
  10 #include <asm/pgtable-types.h>
  11
  12 /*
  13  * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
  14  * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/8 of kernel virtual addresses.
  15  */
  16 #define KASAN_SHADOW_START      (VA_START)
  17 #define KASAN_SHADOW_END        (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
  18
  19 /*
  20  * This value is used to map an address to the corresponding shadow
  21  * address by the following formula:
  22  *     shadow_addr = (address >> 3) + KASAN_SHADOW_OFFSET;
  23  *
  24  * (1 << 61) shadow addresses - [KASAN_SHADOW_OFFSET,KASAN_SHADOW_END]
  25  * cover all 64-bits of virtual addresses. So KASAN_SHADOW_OFFSET
  26  * should satisfy the following equation:
  27  *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - (1ULL << 61)
  28  */
  29 #define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << (64 - 3)))
  30
  31 void kasan_init(void);
  32 void kasan_copy_shadow(pgd_t *pgdir);
  33 asmlinkage void kasan_early_init(void);
  34
  35 #else
  36 static inline void kasan_init(void) { }
  37 static inline void kasan_copy_shadow(pgd_t *pgdir) { }
  38 #endif
  39
  40 #endif
  41 #endif