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
26static inline bool sme_active(void) { return false; }
27static inline bool sev_active(void) { return false; }
28
29#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
30
31static inline bool mem_encrypt_active(void)
32{
33 return sme_me_mask;
34}
35
36static inline u64 sme_get_me_mask(void)
37{
38 return sme_me_mask;
39}
40
41#ifdef CONFIG_AMD_MEM_ENCRYPT
42/*
43 * The __sme_set() and __sme_clr() macros are useful for adding or removing
44 * the encryption mask from a value (e.g. when dealing with pagetable
45 * entries).
46 */
47#define __sme_set(x) ((x) | sme_me_mask)
48#define __sme_clr(x) ((x) & ~sme_me_mask)
49#else
50#define __sme_set(x) (x)
51#define __sme_clr(x) (x)
52#endif
53
54#endif /* __ASSEMBLY__ */
55
56#endif /* __MEM_ENCRYPT_H__ */
57