2017-07-18 05:10:03 +08:00
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/*
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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 __X86_MEM_ENCRYPT_H__
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#define __X86_MEM_ENCRYPT_H__
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#ifndef __ASSEMBLY__
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2017-07-18 05:10:05 +08:00
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#include <linux/init.h>
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2017-07-18 05:10:03 +08:00
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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extern unsigned long sme_me_mask;
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2017-07-18 05:10:10 +08:00
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void __init sme_early_encrypt(resource_size_t paddr,
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unsigned long size);
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void __init sme_early_decrypt(resource_size_t paddr,
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unsigned long size);
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2017-07-18 05:10:07 +08:00
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void __init sme_early_init(void);
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2017-07-18 05:10:05 +08:00
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void __init sme_encrypt_kernel(void);
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void __init sme_enable(void);
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2017-07-18 05:10:03 +08:00
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#else /* !CONFIG_AMD_MEM_ENCRYPT */
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#define sme_me_mask 0UL
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2017-07-18 05:10:10 +08:00
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static inline void __init sme_early_encrypt(resource_size_t paddr,
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unsigned long size) { }
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static inline void __init sme_early_decrypt(resource_size_t paddr,
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unsigned long size) { }
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2017-07-18 05:10:07 +08:00
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static inline void __init sme_early_init(void) { }
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2017-07-18 05:10:05 +08:00
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static inline void __init sme_encrypt_kernel(void) { }
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static inline void __init sme_enable(void) { }
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2017-07-18 05:10:03 +08:00
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#endif /* CONFIG_AMD_MEM_ENCRYPT */
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2017-07-18 05:10:07 +08:00
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/*
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* The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
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* writing to or comparing values from the cr3 register. Having the
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* encryption mask set in cr3 enables the PGD entry to be encrypted and
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* avoid special case handling of PGD allocations.
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*/
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#define __sme_pa(x) (__pa(x) | sme_me_mask)
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#define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
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2017-07-18 05:10:03 +08:00
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#endif /* __ASSEMBLY__ */
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#endif /* __X86_MEM_ENCRYPT_H__ */
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