1 /* 2 * AMD Memory Encryption Support 3 * 4 * Copyright (C) 2016 Advanced Micro Devices, Inc. 5 * 6 * Author: Tom Lendacky <[email protected]> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #ifndef __MEM_ENCRYPT_H__ 14 #define __MEM_ENCRYPT_H__ 15 16 #ifndef __ASSEMBLY__ 17 18 #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT 19 20 #include <asm/mem_encrypt.h> 21 22 #else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */ 23 24 #define sme_me_mask 0UL 25 26 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 27 28 static inline bool sme_active(void) 29 { 30 return !!sme_me_mask; 31 } 32 33 static inline unsigned long sme_get_me_mask(void) 34 { 35 return sme_me_mask; 36 } 37 38 /* 39 * The __sme_set() and __sme_clr() macros are useful for adding or removing 40 * the encryption mask from a value (e.g. when dealing with pagetable 41 * entries). 42 */ 43 #define __sme_set(x) ((unsigned long)(x) | sme_me_mask) 44 #define __sme_clr(x) ((unsigned long)(x) & ~sme_me_mask) 45 46 #endif /* __ASSEMBLY__ */ 47 48 #endif /* __MEM_ENCRYPT_H__ */ 49