| /* SPDX-License-Identifier: GPL-2.0-only */ |
| /* |
| * AMD Memory Encryption Support |
| * |
| * Copyright (C) 2016 Advanced Micro Devices, Inc. |
| * |
| * Author: Tom Lendacky <[email protected]> |
| */ |
| |
| #ifndef __MEM_ENCRYPT_H__ |
| #define __MEM_ENCRYPT_H__ |
| |
| #ifndef __ASSEMBLY__ |
| |
| #ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT |
| |
| #include <asm/mem_encrypt.h> |
| |
| #endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ |
| |
| #ifdef CONFIG_AMD_MEM_ENCRYPT |
| /* |
| * The __sme_set() and __sme_clr() macros are useful for adding or removing |
| * the encryption mask from a value (e.g. when dealing with pagetable |
| * entries). |
| */ |
| #define __sme_set(x) ((x) | sme_me_mask) |
| #define __sme_clr(x) ((x) & ~sme_me_mask) |
| |
| #define dma_addr_encrypted(x) __sme_set(x) |
| #define dma_addr_canonical(x) __sme_clr(x) |
| |
| #else |
| #define __sme_set(x) (x) |
| #define __sme_clr(x) (x) |
| #endif |
| |
| /* |
| * dma_addr_encrypted() and dma_addr_unencrypted() are for converting a given DMA |
| * address to the respective type of addressing. |
| * |
| * dma_addr_canonical() is used to reverse any conversions for encrypted/decrypted |
| * back to the canonical address. |
| */ |
| #ifndef dma_addr_encrypted |
| #define dma_addr_encrypted(x) (x) |
| #endif |
| |
| #ifndef dma_addr_unencrypted |
| #define dma_addr_unencrypted(x) (x) |
| #endif |
| |
| #ifndef dma_addr_canonical |
| #define dma_addr_canonical(x) (x) |
| #endif |
| |
| #endif /* __ASSEMBLY__ */ |
| |
| #endif /* __MEM_ENCRYPT_H__ */ |
