diff options
Diffstat (limited to 'include/linux/mem_encrypt.h')
| -rw-r--r-- | include/linux/mem_encrypt.h | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/include/linux/mem_encrypt.h b/include/linux/mem_encrypt.h new file mode 100644 index 000000000000..07584c5e36fb --- /dev/null +++ b/include/linux/mem_encrypt.h @@ -0,0 +1,59 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * AMD Memory Encryption Support + * + * Copyright (C) 2016 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky <thomas.lendacky@amd.com> + */ + +#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__ */ |