| /* |
| * AMD Memory Encryption Support |
| * |
| * Copyright (C) 2016 Advanced Micro Devices, Inc. |
| * |
| * Author: Tom Lendacky <thomas.lendacky@amd.com> |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License version 2 as |
| * published by the Free Software Foundation. |
| */ |
| |
| #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 */ |
| |
| #define sme_me_mask 0UL |
| |
| #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ |
| |
| static inline bool sme_active(void) |
| { |
| return !!sme_me_mask; |
| } |
| |
| static inline unsigned long sme_get_me_mask(void) |
| { |
| return sme_me_mask; |
| } |
| |
| /* |
| * 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) ((unsigned long)(x) | sme_me_mask) |
| #define __sme_clr(x) ((unsigned long)(x) & ~sme_me_mask) |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* __MEM_ENCRYPT_H__ */ |