[mirror_ubuntu-hirsute-kernel.git] / include / linux / mem_encrypt.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * AMD Memory Encryption Support
 *
 * Copyright (C) 2016 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 */

#ifndef __MEM_ENCRYPT_H__
#define __MEM_ENCRYPT_H__

#ifndef __ASSEMBLY__

#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT

#include <asm/mem_encrypt.h>

#else	/* !CONFIG_ARCH_HAS_MEM_ENCRYPT */

static inline bool mem_encrypt_active(void) { return false; }

#endif	/* CONFIG_ARCH_HAS_MEM_ENCRYPT */

#ifdef CONFIG_AMD_MEM_ENCRYPT
/*
 * The __sme_set() and __sme_clr() macros are useful for adding or removing
 * the encryption mask from a value (e.g. when dealing with pagetable
 * entries).
 */
#define __sme_set(x)		((x) | sme_me_mask)
#define __sme_clr(x)		((x) & ~sme_me_mask)
#else
#define __sme_set(x)		(x)
#define __sme_clr(x)		(x)
#endif

#endif	/* __ASSEMBLY__ */

#endif	/* __MEM_ENCRYPT_H__ */
Commit	Line	Data
d2912cb1	1	/* SPDX-License-Identifier: GPL-2.0-only */
7744ccdb TL	2	/*
	3	* AMD Memory Encryption Support
	4	*
	5	* Copyright (C) 2016 Advanced Micro Devices, Inc.
	6	*
	7	* Author: Tom Lendacky <thomas.lendacky@amd.com>
7744ccdb TL	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
284e21fa	21	static inline bool mem_encrypt_active(void) { return false; }
d8aa7eea	22
7744ccdb TL	23	#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
7744ccdb TL	24
21d9bb4a	25	#ifdef CONFIG_AMD_MEM_ENCRYPT
21729f81 TL	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	*/
21d9bb4a BP	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
21729f81	37
7744ccdb TL	38	#endif /* __ASSEMBLY__ */
	39
	40	#endif /* __MEM_ENCRYPT_H__ */