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 static inline bool mem_encrypt_active(void) { return false; }
>> 22
19 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 23 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
20 24
21 #ifdef CONFIG_AMD_MEM_ENCRYPT 25 #ifdef CONFIG_AMD_MEM_ENCRYPT
22 /* 26 /*
23 * The __sme_set() and __sme_clr() macros are 27 * The __sme_set() and __sme_clr() macros are useful for adding or removing
24 * the encryption mask from a value (e.g. when 28 * the encryption mask from a value (e.g. when dealing with pagetable
25 * entries). 29 * entries).
26 */ 30 */
27 #define __sme_set(x) ((x) | sme_me_ 31 #define __sme_set(x) ((x) | sme_me_mask)
28 #define __sme_clr(x) ((x) & ~sme_me 32 #define __sme_clr(x) ((x) & ~sme_me_mask)
29 #else 33 #else
30 #define __sme_set(x) (x) 34 #define __sme_set(x) (x)
31 #define __sme_clr(x) (x) 35 #define __sme_clr(x) (x)
32 #endif 36 #endif
33 37
34 #endif /* __ASSEMBLY__ */ 38 #endif /* __ASSEMBLY__ */
35 39
36 #endif /* __MEM_ENCRYPT_H__ */ 40 #endif /* __MEM_ENCRYPT_H__ */
37 41
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