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Tom Lendacky7744ccd2017-07-17 16:10:03 -05001/*
2 * AMD Memory Encryption Support
3 *
4 * Copyright (C) 2016 Advanced Micro Devices, Inc.
5 *
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.
11 */
12
13#ifndef __X86_MEM_ENCRYPT_H__
14#define __X86_MEM_ENCRYPT_H__
15
16#ifndef __ASSEMBLY__
17
Tom Lendacky5868f362017-07-17 16:10:05 -050018#include <linux/init.h>
19
Tom Lendacky7744ccd2017-07-17 16:10:03 -050020#ifdef CONFIG_AMD_MEM_ENCRYPT
21
22extern unsigned long sme_me_mask;
23
Tom Lendacky21729f82017-07-17 16:10:07 -050024void __init sme_early_init(void);
25
Tom Lendacky5868f362017-07-17 16:10:05 -050026void __init sme_encrypt_kernel(void);
27void __init sme_enable(void);
28
Tom Lendacky7744ccd2017-07-17 16:10:03 -050029#else /* !CONFIG_AMD_MEM_ENCRYPT */
30
31#define sme_me_mask 0UL
32
Tom Lendacky21729f82017-07-17 16:10:07 -050033static inline void __init sme_early_init(void) { }
34
Tom Lendacky5868f362017-07-17 16:10:05 -050035static inline void __init sme_encrypt_kernel(void) { }
36static inline void __init sme_enable(void) { }
37
Tom Lendacky7744ccd2017-07-17 16:10:03 -050038#endif /* CONFIG_AMD_MEM_ENCRYPT */
39
Tom Lendacky21729f82017-07-17 16:10:07 -050040/*
41 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
42 * writing to or comparing values from the cr3 register. Having the
43 * encryption mask set in cr3 enables the PGD entry to be encrypted and
44 * avoid special case handling of PGD allocations.
45 */
46#define __sme_pa(x) (__pa(x) | sme_me_mask)
47#define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
48
Tom Lendacky7744ccd2017-07-17 16:10:03 -050049#endif /* __ASSEMBLY__ */
50
51#endif /* __X86_MEM_ENCRYPT_H__ */