1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef _ASM_X86_KASAN_H
3 #define _ASM_X86_KASAN_H
4
5 #include <linux/const.h>
6 #define KASAN_SHADOW_OFFSET _AC(CONFIG_KASAN_SHADOW_OFFSET, UL)
7 #define KASAN_SHADOW_SCALE_SHIFT 3
8
9 /*
10 * Compiler uses shadow offset assuming that addresses start
11 * from 0. Kernel addresses don't start from 0, so shadow
12 * for kernel really starts from compiler's shadow offset +
13 * 'kernel address space start' >> KASAN_SHADOW_SCALE_SHIFT
14 */
15 #define KASAN_SHADOW_START (KASAN_SHADOW_OFFSET + \
16 ((-1UL << __VIRTUAL_MASK_SHIFT) >> \
17 KASAN_SHADOW_SCALE_SHIFT))
18 /*
19 * 47 bits for kernel address -> (47 - KASAN_SHADOW_SCALE_SHIFT) bits for shadow
20 * 56 bits for kernel address -> (56 - KASAN_SHADOW_SCALE_SHIFT) bits for shadow
21 */
22 #define KASAN_SHADOW_END (KASAN_SHADOW_START + \
23 (1ULL << (__VIRTUAL_MASK_SHIFT - \
24 KASAN_SHADOW_SCALE_SHIFT)))
25
26 #ifndef __ASSEMBLY__
27
28 #ifdef CONFIG_KASAN
29 void __init kasan_early_init(void);
30 void __init kasan_init(void);
31 void __init kasan_populate_shadow_for_vaddr(void *va, size_t size, int nid);
32 #else
33 static inline void kasan_early_init(void) { }
34 static inline void kasan_init(void) { }
35 static inline void kasan_populate_shadow_for_vaddr(void *va, size_t size,
36 int nid) { }
37 #endif
38
39 #endif
40
41 #endif
42
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