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/* SPDX-License-Identifier: GPL-2.0-only */
/*
* AMD Memory Encryption Support
*
* Copyright (C) 2016 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <[email protected]>
*/
#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__ */