include/asm/kasan.h

0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _ASM_X86_KASAN_H
0003 #define _ASM_X86_KASAN_H
0004
0005 #include <linux/const.h>
0006 #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
0007 #define KASAN_SHADOW_SCALE_SHIFT 3
0008
0009 /*
0010  * Compiler uses shadow offset assuming that addresses start
0011  * from 0. Kernel addresses don't start from 0, so shadow
0012  * for kernel really starts from compiler's shadow offset +
0013  * 'kernel address space start' >> KASAN_SHADOW_SCALE_SHIFT
0014  */
0015 #define KASAN_SHADOW_START      (KASAN_SHADOW_OFFSET + \
0016                     ((-1UL << __VIRTUAL_MASK_SHIFT) >> \
0017                         KASAN_SHADOW_SCALE_SHIFT))
0018 /*
0019  * 47 bits for kernel address -> (47 - KASAN_SHADOW_SCALE_SHIFT) bits for shadow
0020  * 56 bits for kernel address -> (56 - KASAN_SHADOW_SCALE_SHIFT) bits for shadow
0021  */
0022 #define KASAN_SHADOW_END        (KASAN_SHADOW_START + \
0023                     (1ULL << (__VIRTUAL_MASK_SHIFT - \
0024                           KASAN_SHADOW_SCALE_SHIFT)))
0025
0026 #ifndef __ASSEMBLY__
0027
0028 #ifdef CONFIG_KASAN
0029 void __init kasan_early_init(void);
0030 void __init kasan_init(void);
0031 #else
0032 static inline void kasan_early_init(void) { }
0033 static inline void kasan_init(void) { }
0034 #endif
0035
0036 #endif
0037
0038 #endif