| 1 |
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| 2 | |
| 3 | * AMD Memory Encryption Support
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| 4 | *
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| 5 | * Copyright (C) 2016 Advanced Micro Devices, Inc.
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| 6 | *
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| 7 | * Author: Tom Lendacky <[email protected]>
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| 8 |
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| 9 |
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| 10 | #ifndef __MEM_ENCRYPT_H__
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| 11 | #define __MEM_ENCRYPT_H__
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| 12 |
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| 13 | #ifndef __ASSEMBLY__
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| 14 |
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| 15 | #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
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| 16 |
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| 17 | #include <asm/mem_encrypt.h>
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| 18 |
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| 19 | #endif
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| 20 |
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| 21 | #ifdef CONFIG_AMD_MEM_ENCRYPT
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| 22 | |
| 23 | * The __sme_set() and __sme_clr() macros are useful for adding or removing
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| 24 | * the encryption mask from a value (e.g. when dealing with pagetable
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| 25 | * entries).
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| 26 |
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| 27 | #define __sme_set(x) ((x) | sme_me_mask)
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| 28 | #define __sme_clr(x) ((x) & ~sme_me_mask)
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| 29 |
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| 30 | #define dma_addr_encrypted(x) __sme_set(x)
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| 31 | #define dma_addr_canonical(x) __sme_clr(x)
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| 32 |
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| 33 | #else
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| 34 | #define __sme_set(x) (x)
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| 35 | #define __sme_clr(x) (x)
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| 36 | #endif
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| 37 |
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| 38 | |
| 39 | * dma_addr_encrypted() and dma_addr_unencrypted() are for converting a given DMA
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| 40 | * address to the respective type of addressing.
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| 41 | *
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| 42 | * dma_addr_canonical() is used to reverse any conversions for encrypted/decrypted
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| 43 | * back to the canonical address.
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| 44 |
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| 45 | #ifndef dma_addr_encrypted
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| 46 | #define dma_addr_encrypted(x) (x)
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| 47 | #endif
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| 48 |
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| 49 | #ifndef dma_addr_unencrypted
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| 50 | #define dma_addr_unencrypted(x) (x)
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| 51 | #endif
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| 52 |
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| 53 | #ifndef dma_addr_canonical
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| 54 | #define dma_addr_canonical(x) (x)
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| 55 | #endif
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| 56 |
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| 57 | #endif
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| 58 |
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| 59 | #endif
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