arch/riscv/include/asm/kasan.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /* Copyright (C) 2019 Andes Technology Corporation */
   3
   4 #ifndef __ASM_KASAN_H
   5 #define __ASM_KASAN_H
   6
   7 #ifndef __ASSEMBLY__
   8
   9 #ifdef CONFIG_KASAN
  10
  11 /*
  12  * The following comment was copied from arm64:
  13  * KASAN_SHADOW_START: beginning of the kernel virtual addresses.
  14  * KASAN_SHADOW_END: KASAN_SHADOW_START + 1/N of kernel virtual addresses,
  15  * where N = (1 << KASAN_SHADOW_SCALE_SHIFT).
  16  *
  17  * KASAN_SHADOW_OFFSET:
  18  * This value is used to map an address to the corresponding shadow
  19  * address by the following formula:
  20  *     shadow_addr = (address >> KASAN_SHADOW_SCALE_SHIFT) + KASAN_SHADOW_OFFSET
  21  *
  22  * (1 << (64 - KASAN_SHADOW_SCALE_SHIFT)) shadow addresses that lie in range
  23  * [KASAN_SHADOW_OFFSET, KASAN_SHADOW_END) cover all 64-bits of virtual
  24  * addresses. So KASAN_SHADOW_OFFSET should satisfy the following equation:
  25  *      KASAN_SHADOW_OFFSET = KASAN_SHADOW_END -
  26  *                              (1ULL << (64 - KASAN_SHADOW_SCALE_SHIFT))
  27  */
  28 #define KASAN_SHADOW_SCALE_SHIFT        3
  29
  30 #define KASAN_SHADOW_SIZE       (UL(1) << ((CONFIG_VA_BITS - 1) - KASAN_SHADOW_SCALE_SHIFT))
  31 #define KASAN_SHADOW_START      KERN_VIRT_START
  32 #define KASAN_SHADOW_END        (KASAN_SHADOW_START + KASAN_SHADOW_SIZE)
  33 #define KASAN_SHADOW_OFFSET     (KASAN_SHADOW_END - (1ULL << \
  34                                         (64 - KASAN_SHADOW_SCALE_SHIFT)))
  35
  36 void kasan_init(void);
  37 asmlinkage void kasan_early_init(void);
  38
  39 #endif
  40 #endif
  41 #endif /* __ASM_KASAN_H */