1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * AMD Memory Encryption Support
4  *
5  * Copyright (C) 2016 Advanced Micro Devices, Inc.
6  *
7  * Author: Tom Lendacky <thomas.lendacky@amd.com>
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 
mem_encrypt_active(void)21 static inline bool mem_encrypt_active(void) { return false; }
22 
23 #endif	/* CONFIG_ARCH_HAS_MEM_ENCRYPT */
24 
25 #ifdef CONFIG_AMD_MEM_ENCRYPT
26 /*
27  * The __sme_set() and __sme_clr() macros are useful for adding or removing
28  * the encryption mask from a value (e.g. when dealing with pagetable
29  * entries).
30  */
31 #define __sme_set(x)		((x) | sme_me_mask)
32 #define __sme_clr(x)		((x) & ~sme_me_mask)
33 #else
34 #define __sme_set(x)		(x)
35 #define __sme_clr(x)		(x)
36 #endif
37 
38 #endif	/* __ASSEMBLY__ */
39 
40 #endif	/* __MEM_ENCRYPT_H__ */
41