1 /* SPDX-License-Identifier: GPL-2.0-only */ <<
2 /* 1 /*
3 * AMD Memory Encryption Support 2 * AMD Memory Encryption Support
4 * 3 *
5 * Copyright (C) 2016 Advanced Micro Devices, 4 * Copyright (C) 2016 Advanced Micro Devices, Inc.
6 * 5 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.c 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.
8 */ 11 */
9 12
10 #ifndef __MEM_ENCRYPT_H__ 13 #ifndef __MEM_ENCRYPT_H__
11 #define __MEM_ENCRYPT_H__ 14 #define __MEM_ENCRYPT_H__
12 15
13 #ifndef __ASSEMBLY__ 16 #ifndef __ASSEMBLY__
14 17
15 #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT 18 #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
16 19
17 #include <asm/mem_encrypt.h> 20 #include <asm/mem_encrypt.h>
18 21
>> 22 #else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
>> 23
>> 24 #define sme_me_mask 0ULL
>> 25
>> 26 static inline bool sme_active(void) { return false; }
>> 27 static inline bool sev_active(void) { return false; }
>> 28
19 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 29 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
>> 30
>> 31 static inline bool mem_encrypt_active(void)
>> 32 {
>> 33 return sme_me_mask;
>> 34 }
>> 35
>> 36 static inline u64 sme_get_me_mask(void)
>> 37 {
>> 38 return sme_me_mask;
>> 39 }
20 40
21 #ifdef CONFIG_AMD_MEM_ENCRYPT 41 #ifdef CONFIG_AMD_MEM_ENCRYPT
22 /* 42 /*
23 * The __sme_set() and __sme_clr() macros are 43 * The __sme_set() and __sme_clr() macros are useful for adding or removing
24 * the encryption mask from a value (e.g. when 44 * the encryption mask from a value (e.g. when dealing with pagetable
25 * entries). 45 * entries).
26 */ 46 */
27 #define __sme_set(x) ((x) | sme_me_ 47 #define __sme_set(x) ((x) | sme_me_mask)
28 #define __sme_clr(x) ((x) & ~sme_me 48 #define __sme_clr(x) ((x) & ~sme_me_mask)
29 #else 49 #else
30 #define __sme_set(x) (x) 50 #define __sme_set(x) (x)
31 #define __sme_clr(x) (x) 51 #define __sme_clr(x) (x)
32 #endif 52 #endif
33 53
34 #endif /* __ASSEMBLY__ */ 54 #endif /* __ASSEMBLY__ */
35 55
36 #endif /* __MEM_ENCRYPT_H__ */ 56 #endif /* __MEM_ENCRYPT_H__ */
37 57
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