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7744ccdb TL |
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 | ||
21d9bb4a | 24 | #define sme_me_mask 0ULL |
7744ccdb | 25 | |
d8aa7eea TL |
26 | static inline bool sme_active(void) { return false; } |
27 | static inline bool sev_active(void) { return false; } | |
28 | ||
7744ccdb TL |
29 | #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ |
30 | ||
d8aa7eea | 31 | static inline bool mem_encrypt_active(void) |
7744ccdb | 32 | { |
d8aa7eea | 33 | return sme_me_mask; |
7744ccdb TL |
34 | } |
35 | ||
21d9bb4a | 36 | static inline u64 sme_get_me_mask(void) |
5868f365 TL |
37 | { |
38 | return sme_me_mask; | |
39 | } | |
40 | ||
21d9bb4a | 41 | #ifdef CONFIG_AMD_MEM_ENCRYPT |
21729f81 TL |
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 | */ | |
21d9bb4a BP |
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 | |
21729f81 | 53 | |
7744ccdb TL |
54 | #endif /* __ASSEMBLY__ */ |
55 | ||
56 | #endif /* __MEM_ENCRYPT_H__ */ |