include/linux/mem_encrypt.h

Source file repositories/reference/linux-study-clean/include/linux/mem_encrypt.h

File Facts

System
Linux kernel
Corpus path
include/linux/mem_encrypt.h
Extension
.h
Size
1340 bytes
Lines
60
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#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__ */

Annotation

Implementation Notes