1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * AMD Memory Encryption Support 4 * 5 * Copyright (C) 2016 Advanced Micro Devices, Inc. 6 * 7 * Author: Tom Lendacky <[email protected]> 8 */ 9 10 #ifndef __MEM_ENCRYPT_H__ 11 #define __MEM_ENCRYPT_H__ 12 13 #ifndef __ASSEMBLY__ 14 15 #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT 16 17 #include <asm/mem_encrypt.h> 18 19 #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ 20 21 #ifdef CONFIG_AMD_MEM_ENCRYPT 22 /* 23 * The __sme_set() and __sme_clr() macros are useful for adding or removing 24 * the encryption mask from a value (e.g. when dealing with pagetable 25 * entries). 26 */ 27 #define __sme_set(x) ((x) | sme_me_mask) 28 #define __sme_clr(x) ((x) & ~sme_me_mask) 29 30 #define dma_addr_encrypted(x) __sme_set(x) 31 #define dma_addr_canonical(x) __sme_clr(x) 32 33 #else 34 #define __sme_set(x) (x) 35 #define __sme_clr(x) (x) 36 #endif 37 38 /* 39 * dma_addr_encrypted() and dma_addr_unencrypted() are for converting a given DMA 40 * address to the respective type of addressing. 41 * 42 * dma_addr_canonical() is used to reverse any conversions for encrypted/decrypted 43 * back to the canonical address. 44 */ 45 #ifndef dma_addr_encrypted 46 #define dma_addr_encrypted(x) (x) 47 #endif 48 49 #ifndef dma_addr_unencrypted 50 #define dma_addr_unencrypted(x) (x) 51 #endif 52 53 #ifndef dma_addr_canonical 54 #define dma_addr_canonical(x) (x) 55 #endif 56 57 #endif /* __ASSEMBLY__ */ 58 59 #endif /* __MEM_ENCRYPT_H__ */ 60