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 23 static inline bool sme_active(void) { return false; } 24 static inline bool sev_active(void) { return false; } 25 26 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 27 28 static inline bool mem_encrypt_active(void) 29 { 30 return sme_me_mask; 31 } 32 33 static 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