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#else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */ 20 21#define sme_me_mask 0ULL 22 23static inline bool sme_active(void) { return false; } 24static inline bool sev_active(void) { return false; } 25 26#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 27 28static inline bool mem_encrypt_active(void) 29{ 30 return sme_me_mask; 31} 32 33static inline u64 sme_get_me_mask(void) 34{ 35 return sme_me_mask; 36} 37 38#ifdef CONFIG_AMD_MEM_ENCRYPT 39/* 40 * The __sme_set() and __sme_clr() macros are useful for adding or removing 41 * the encryption mask from a value (e.g. when dealing with pagetable 42 * entries). 43 */ 44#define __sme_set(x) ((x) | sme_me_mask) 45#define __sme_clr(x) ((x) & ~sme_me_mask) 46#else 47#define __sme_set(x) (x) 48#define __sme_clr(x) (x) 49#endif 50 51#endif /* __ASSEMBLY__ */ 52 53#endif /* __MEM_ENCRYPT_H__ */ 54