projects / linux-2.6-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 7744ccdb TL |
1 | /* |
| 2 | * AMD Memory Encryption Support | |
| 3 | * | |
| 4 | * Copyright (C) 2016 Advanced Micro Devices, Inc. | |
| 5 | * | |
| 6 | * Author: Tom Lendacky <thomas.lendacky@amd.com> | |
| 7 | * | |
| 8 | * This program is free software; you can redistribute it and/or modify | |
| 9 | * it under the terms of the GNU General Public License version 2 as | |
| 10 | * published by the Free Software Foundation. | |
| 11 | */ | |
| 12 | ||
| 13 | #ifndef __X86_MEM_ENCRYPT_H__ | |
| 14 | #define __X86_MEM_ENCRYPT_H__ | |
| 15 | ||
| 16 | #ifndef __ASSEMBLY__ | |
| 17 | ||
| 5868f365 TL |
18 | #include <linux/init.h> |
| 19 | ||
| 7744ccdb TL |
20 | #ifdef CONFIG_AMD_MEM_ENCRYPT |
| 21 | ||
| 22 | extern unsigned long sme_me_mask; | |
| 23 | ||
| 21729f81 TL |
24 | void __init sme_early_init(void); |
| 25 | ||
| 5868f365 TL |
26 | void __init sme_encrypt_kernel(void); |
| 27 | void __init sme_enable(void); | |
| 28 | ||
| 7744ccdb TL |
29 | #else /* !CONFIG_AMD_MEM_ENCRYPT */ |
| 30 | ||
| 31 | #define sme_me_mask 0UL | |
| 32 | ||
| 21729f81 TL |
33 | static inline void __init sme_early_init(void) { } |
| 34 | ||
| 5868f365 TL |
35 | static inline void __init sme_encrypt_kernel(void) { } |
| 36 | static inline void __init sme_enable(void) { } | |
| 37 | ||
| 7744ccdb TL |
38 | #endif /* CONFIG_AMD_MEM_ENCRYPT */ |
| 39 | ||
| 21729f81 TL |
40 | /* |
| 41 | * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when | |
| 42 | * writing to or comparing values from the cr3 register. Having the | |
| 43 | * encryption mask set in cr3 enables the PGD entry to be encrypted and | |
| 44 | * avoid special case handling of PGD allocations. | |
| 45 | */ | |
| 46 | #define __sme_pa(x) (__pa(x) | sme_me_mask) | |
| 47 | #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask) | |
| 48 | ||
| 7744ccdb TL |
49 | #endif /* __ASSEMBLY__ */ |
| 50 | ||
| 51 | #endif /* __X86_MEM_ENCRYPT_H__ */ |