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
  11 /*
  12  * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
  13  * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/8 of kernel virtual addresses.
  14  */
  15 #define KASAN_SHADOW_START      (VA_START)
  16 #define KASAN_SHADOW_END        (KASAN_SHADOW_START + (1UL << (VA_BITS - 3)))
  17
  18 /*
  19  * This value is used to map an address to the corresponding shadow
  20  * address by the following formula:
  21  *     shadow_addr = (address >> 3) + KASAN_SHADOW_OFFSET;
  22  *
  23  * (1 << 61) shadow addresses - [KASAN_SHADOW_OFFSET,KASAN_SHADOW_END]
  24  * cover all 64-bits of virtual addresses. So KASAN_SHADOW_OFFSET
  25  * should satisfy the following equation:
  26  *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END - (1ULL << 61)
  27  */
  28 #define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << (64 - 3)))
  29
  30 void kasan_init(void);
  31 asmlinkage void kasan_early_init(void);
  32
  33 #else
  34 static inline void kasan_init(void) { }
  35 #endif
  36
  37 #endif
  38 #endif