1 /* SPDX-License-Identifier: GPL-2.0-only */ 1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /* 2 /*
3 * AMD Memory Encryption Support 3 * AMD Memory Encryption Support
4 * 4 *
5 * Copyright (C) 2016 Advanced Micro Devices, 5 * Copyright (C) 2016 Advanced Micro Devices, Inc.
6 * 6 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.c 7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 */ 8 */
9 9
10 #ifndef __MEM_ENCRYPT_H__ 10 #ifndef __MEM_ENCRYPT_H__
11 #define __MEM_ENCRYPT_H__ 11 #define __MEM_ENCRYPT_H__
12 12
13 #ifndef __ASSEMBLY__ 13 #ifndef __ASSEMBLY__
14 14
15 #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT 15 #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
16 16
17 #include <asm/mem_encrypt.h> 17 #include <asm/mem_encrypt.h>
18 18
>> 19 #else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
>> 20
>> 21 #define sme_me_mask 0ULL
>> 22
>> 23 static inline bool sme_active(void) { return false; }
>> 24 static inline bool sev_active(void) { return false; }
>> 25
19 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 26 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
>> 27
>> 28 static inline bool mem_encrypt_active(void)
>> 29 {
>> 30 return sme_me_mask;
>> 31 }
>> 32
>> 33 static inline u64 sme_get_me_mask(void)
>> 34 {
>> 35 return sme_me_mask;
>> 36 }
20 37
21 #ifdef CONFIG_AMD_MEM_ENCRYPT 38 #ifdef CONFIG_AMD_MEM_ENCRYPT
22 /* 39 /*
23 * The __sme_set() and __sme_clr() macros are 40 * The __sme_set() and __sme_clr() macros are useful for adding or removing
24 * the encryption mask from a value (e.g. when 41 * the encryption mask from a value (e.g. when dealing with pagetable
25 * entries). 42 * entries).
26 */ 43 */
27 #define __sme_set(x) ((x) | sme_me_ 44 #define __sme_set(x) ((x) | sme_me_mask)
28 #define __sme_clr(x) ((x) & ~sme_me 45 #define __sme_clr(x) ((x) & ~sme_me_mask)
29 #else 46 #else
30 #define __sme_set(x) (x) 47 #define __sme_set(x) (x)
31 #define __sme_clr(x) (x) 48 #define __sme_clr(x) (x)
32 #endif 49 #endif
33 50
34 #endif /* __ASSEMBLY__ */ 51 #endif /* __ASSEMBLY__ */
35 52
36 #endif /* __MEM_ENCRYPT_H__ */ 53 #endif /* __MEM_ENCRYPT_H__ */
37 54
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