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d2912cb1 | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
7744ccdb TL |
2 | /* |
3 | * AMD Memory Encryption Support | |
4 | * | |
5 | * Copyright (C) 2016 Advanced Micro Devices, Inc. | |
6 | * | |
7 | * Author: Tom Lendacky <thomas.lendacky@amd.com> | |
7744ccdb TL |
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 | ||
21d9bb4a | 21 | #define sme_me_mask 0ULL |
7744ccdb | 22 | |
d8aa7eea TL |
23 | static inline bool sme_active(void) { return false; } |
24 | static inline bool sev_active(void) { return false; } | |
25 | ||
7744ccdb TL |
26 | #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ |
27 | ||
d8aa7eea | 28 | static inline bool mem_encrypt_active(void) |
7744ccdb | 29 | { |
d8aa7eea | 30 | return sme_me_mask; |
7744ccdb TL |
31 | } |
32 | ||
21d9bb4a | 33 | static inline u64 sme_get_me_mask(void) |
5868f365 TL |
34 | { |
35 | return sme_me_mask; | |
36 | } | |
37 | ||
21d9bb4a | 38 | #ifdef CONFIG_AMD_MEM_ENCRYPT |
21729f81 TL |
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 | */ | |
21d9bb4a BP |
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 | |
21729f81 | 50 | |
7744ccdb TL |
51 | #endif /* __ASSEMBLY__ */ |
52 | ||
53 | #endif /* __MEM_ENCRYPT_H__ */ |