1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * AMD Memory Encryption Support
4 *
5 * Copyright (C) 2016 Advanced Micro Devices, Inc.
6 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 */
9
10#ifndef __MEM_ENCRYPT_H__
11#define __MEM_ENCRYPT_H__
12
13#ifndef __ASSEMBLY__
14
15#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
16
17#include <asm/mem_encrypt.h>
18
19#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
20
21#ifdef CONFIG_AMD_MEM_ENCRYPT
22/*
23 * The __sme_set() and __sme_clr() macros are useful for adding or removing
24 * the encryption mask from a value (e.g. when dealing with pagetable
25 * entries).
26 */
27#define __sme_set(x) ((x) | sme_me_mask)
28#define __sme_clr(x) ((x) & ~sme_me_mask)
29#else
30#define __sme_set(x) (x)
31#define __sme_clr(x) (x)
32#endif
33
34#endif /* __ASSEMBLY__ */
35
36#endif /* __MEM_ENCRYPT_H__ */
37

source code of linux/include/linux/mem_encrypt.h