/* 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__ */
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(vorverarbeitet am 2026-09-29)
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