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1/*
2 * AMD Memory Encryption Support
3 *
4 * Copyright (C) 2016 Advanced Micro Devices, Inc.
5 *
6 * Author: Tom Lendacky <thomas.lendacky@amd.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 as
10 * published by the Free Software Foundation.
11 */
12
13#ifndef __MEM_ENCRYPT_H__
14#define __MEM_ENCRYPT_H__
15
16#ifndef __ASSEMBLY__
17
18#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
19
20#include <asm/mem_encrypt.h>
21
22#else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
23
24#define sme_me_mask 0ULL
25
26#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
27
28static inline bool sme_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__ */