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#else	/* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
20
21static inline bool mem_encrypt_active(void) { return false; }
22
23#endif	/* CONFIG_ARCH_HAS_MEM_ENCRYPT */
24
25#ifdef CONFIG_AMD_MEM_ENCRYPT
26/*
27 * The __sme_set() and __sme_clr() macros are useful for adding or removing
28 * the encryption mask from a value (e.g. when dealing with pagetable
29 * entries).
30 */
31#define __sme_set(x)		((x) | sme_me_mask)
32#define __sme_clr(x)		((x) & ~sme_me_mask)
33#else
34#define __sme_set(x)		(x)
35#define __sme_clr(x)		(x)
36#endif
37
38#endif	/* __ASSEMBLY__ */
39
40#endif	/* __MEM_ENCRYPT_H__ */