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53 lines
1.1 KiB
53 lines
1.1 KiB
/* |
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* AMD Memory Encryption Support |
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* |
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* Copyright (C) 2016 Advanced Micro Devices, Inc. |
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* |
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* Author: Tom Lendacky <thomas.lendacky@amd.com> |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 as |
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* published by the Free Software Foundation. |
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*/ |
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#ifndef __MEM_ENCRYPT_H__ |
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#define __MEM_ENCRYPT_H__ |
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#ifndef __ASSEMBLY__ |
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#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT |
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#include <asm/mem_encrypt.h> |
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#else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */ |
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#define sme_me_mask 0ULL |
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#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ |
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static inline bool sme_active(void) |
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{ |
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return !!sme_me_mask; |
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} |
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static inline u64 sme_get_me_mask(void) |
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{ |
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return sme_me_mask; |
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} |
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#ifdef CONFIG_AMD_MEM_ENCRYPT |
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/* |
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* The __sme_set() and __sme_clr() macros are useful for adding or removing |
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* the encryption mask from a value (e.g. when dealing with pagetable |
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* entries). |
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*/ |
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#define __sme_set(x) ((x) | sme_me_mask) |
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#define __sme_clr(x) ((x) & ~sme_me_mask) |
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#else |
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#define __sme_set(x) (x) |
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#define __sme_clr(x) (x) |
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#endif |
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#endif /* __ASSEMBLY__ */ |
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#endif /* __MEM_ENCRYPT_H__ */
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