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 <[email protected]> 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 static inline bool mem_encrypt_active(void) { return false; } 22 static inline bool sev_active(void) { return false; } 23 24 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 25 26 #ifdef CONFIG_AMD_MEM_ENCRYPT 27 /* 28 * The __sme_set() and __sme_clr() macros are useful for adding or removing 29 * the encryption mask from a value (e.g. when dealing with pagetable 30 * entries). 31 */ 32 #define __sme_set(x) ((x) | sme_me_mask) 33 #define __sme_clr(x) ((x) & ~sme_me_mask) 34 #else 35 #define __sme_set(x) (x) 36 #define __sme_clr(x) (x) 37 #endif 38 39 #endif /* __ASSEMBLY__ */ 40 41 #endif /* __MEM_ENCRYPT_H__ */ 42