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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
30#define dma_addr_encrypted(x) __sme_set(x)
31#define dma_addr_canonical(x) __sme_clr(x)
32
33#else
34#define __sme_set(x) (x)
35#define __sme_clr(x) (x)
36#endif
37
38/*
39 * dma_addr_encrypted() and dma_addr_unencrypted() are for converting a given DMA
40 * address to the respective type of addressing.
41 *
42 * dma_addr_canonical() is used to reverse any conversions for encrypted/decrypted
43 * back to the canonical address.
44 */
45#ifndef dma_addr_encrypted
46#define dma_addr_encrypted(x) (x)
47#endif
48
49#ifndef dma_addr_unencrypted
50#define dma_addr_unencrypted(x) (x)
51#endif
52
53#ifndef dma_addr_canonical
54#define dma_addr_canonical(x) (x)
55#endif
56
57#endif /* __ASSEMBLY__ */
58
59#endif /* __MEM_ENCRYPT_H__ */