diff options
Diffstat (limited to 'include/linux/mem_encrypt.h')
| -rw-r--r-- | include/linux/mem_encrypt.h | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/include/linux/mem_encrypt.h b/include/linux/mem_encrypt.h new file mode 100644 index 000000000000..1255f09f5e42 --- /dev/null +++ b/include/linux/mem_encrypt.h @@ -0,0 +1,48 @@ +/* + * AMD Memory Encryption Support + * + * Copyright (C) 2016 Advanced Micro Devices, Inc. + * + * Author: Tom Lendacky <thomas.lendacky@amd.com> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#ifndef __MEM_ENCRYPT_H__ +#define __MEM_ENCRYPT_H__ + +#ifndef __ASSEMBLY__ + +#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT + +#include <asm/mem_encrypt.h> + +#else /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */ + +#define sme_me_mask 0UL + +#endif /* CONFIG_ARCH_HAS_MEM_ENCRYPT */ + +static inline bool sme_active(void) +{ + return !!sme_me_mask; +} + +static inline unsigned long sme_get_me_mask(void) +{ + return sme_me_mask; +} + +/* + * 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) ((unsigned long)(x) | sme_me_mask) +#define __sme_clr(x) ((unsigned long)(x) & ~sme_me_mask) + +#endif /* __ASSEMBLY__ */ + +#endif /* __MEM_ENCRYPT_H__ */ |