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 #endif	/* CONFIG_ARCH_HAS_MEM_ENCRYPT */
20 
21 #ifdef CONFIG_AMD_MEM_ENCRYPT
22 /*
23  * The __sme_set() and __sme_clr() macros are useful for adding or removing
24  * the encryption mask from a value (e.g. when dealing with pagetable
25  * entries).
26  */
27 #define __sme_set(x)		((x) | sme_me_mask)
28 #define __sme_clr(x)		((x) & ~sme_me_mask)
29 #else
30 #define __sme_set(x)		(x)
31 #define __sme_clr(x)		(x)
32 #endif
33 
34 #endif	/* __ASSEMBLY__ */
35 
36 #endif	/* __MEM_ENCRYPT_H__ */
37