2 * AMD Memory Encryption Support
4 * Copyright (C) 2016 Advanced Micro Devices, Inc.
6 * Author: Tom Lendacky <thomas.lendacky@amd.com>
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.
13 #ifndef __X86_MEM_ENCRYPT_H__
14 #define __X86_MEM_ENCRYPT_H__
18 #include <linux/init.h>
20 #include <asm/bootparam.h>
22 #ifdef CONFIG_AMD_MEM_ENCRYPT
24 extern u64 sme_me_mask;
26 void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
27 unsigned long decrypted_kernel_vaddr,
28 unsigned long kernel_len,
29 unsigned long encryption_wa,
30 unsigned long encryption_pgd);
32 void __init sme_early_encrypt(resource_size_t paddr,
34 void __init sme_early_decrypt(resource_size_t paddr,
37 void __init sme_map_bootdata(char *real_mode_data);
38 void __init sme_unmap_bootdata(char *real_mode_data);
40 void __init sme_early_init(void);
42 void __init sme_encrypt_kernel(struct boot_params *bp);
43 void __init sme_enable(struct boot_params *bp);
45 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
46 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
48 /* Architecture __weak replacement functions */
49 void __init mem_encrypt_init(void);
51 void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);
53 bool sme_active(void);
54 bool sev_active(void);
56 #else /* !CONFIG_AMD_MEM_ENCRYPT */
58 #define sme_me_mask 0ULL
60 static inline void __init sme_early_encrypt(resource_size_t paddr,
61 unsigned long size) { }
62 static inline void __init sme_early_decrypt(resource_size_t paddr,
63 unsigned long size) { }
65 static inline void __init sme_map_bootdata(char *real_mode_data) { }
66 static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
68 static inline void __init sme_early_init(void) { }
70 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
71 static inline void __init sme_enable(struct boot_params *bp) { }
73 static inline bool sme_active(void) { return false; }
74 static inline bool sev_active(void) { return false; }
76 static inline int __init
77 early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
78 static inline int __init
79 early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
81 #endif /* CONFIG_AMD_MEM_ENCRYPT */
84 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
85 * writing to or comparing values from the cr3 register. Having the
86 * encryption mask set in cr3 enables the PGD entry to be encrypted and
87 * avoid special case handling of PGD allocations.
89 #define __sme_pa(x) (__pa(x) | sme_me_mask)
90 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
92 #endif /* __ASSEMBLY__ */
94 #endif /* __X86_MEM_ENCRYPT_H__ */