60 lines
1.3 KiB
C
60 lines
1.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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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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#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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#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
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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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#define dma_addr_encrypted(x) __sme_set(x)
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#define dma_addr_canonical(x) __sme_clr(x)
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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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/*
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* dma_addr_encrypted() and dma_addr_unencrypted() are for converting a given DMA
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* address to the respective type of addressing.
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*
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* dma_addr_canonical() is used to reverse any conversions for encrypted/decrypted
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* back to the canonical address.
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*/
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#ifndef dma_addr_encrypted
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#define dma_addr_encrypted(x) (x)
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#endif
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#ifndef dma_addr_unencrypted
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#define dma_addr_unencrypted(x) (x)
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#endif
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#ifndef dma_addr_canonical
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#define dma_addr_canonical(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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