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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
21#define sme_me_mask 0ULL
22
23static inline bool sme_active(void) { return false; }
24static inline bool sev_active(void) { return false; }
25
26#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
27
28static inline bool mem_encrypt_active(void)
29{
30 return sme_me_mask;
31}
32
33static inline u64 sme_get_me_mask(void)
34{
35 return sme_me_mask;
36}
37
38#ifdef CONFIG_AMD_MEM_ENCRYPT
39/*
40 * The __sme_set() and __sme_clr() macros are useful for adding or removing
41 * the encryption mask from a value (e.g. when dealing with pagetable
42 * entries).
43 */
44#define __sme_set(x) ((x) | sme_me_mask)
45#define __sme_clr(x) ((x) & ~sme_me_mask)
46#else
47#define __sme_set(x) (x)
48#define __sme_clr(x) (x)
49#endif
50
51#endif /* __ASSEMBLY__ */
52
53#endif /* __MEM_ENCRYPT_H__ */