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
18 #include <linux/init.h>
19
20 #include <asm/bootparam.h>
21
22 #ifdef CONFIG_AMD_MEM_ENCRYPT
23
24 extern u64 sme_me_mask;
25
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);
31
32 void __init sme_early_encrypt(resource_size_t paddr,
33 unsigned long size);
34 void __init sme_early_decrypt(resource_size_t paddr,
35 unsigned long size);
36
37 void __init sme_map_bootdata(char *real_mode_data);
38 void __init sme_unmap_bootdata(char *real_mode_data);
39
40 void __init sme_early_init(void);
41
42 void __init sme_encrypt_kernel(struct boot_params *bp);
43 void __init sme_enable(struct boot_params *bp);
44
45 /* Architecture __weak replacement functions */
46 void __init mem_encrypt_init(void);
47
48 void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);
49
50 #else /* !CONFIG_AMD_MEM_ENCRYPT */
51
52 #define sme_me_mask 0ULL
53
sme_early_encrypt(resource_size_t paddr,unsigned long size)54 static inline void __init sme_early_encrypt(resource_size_t paddr,
55 unsigned long size) { }
sme_early_decrypt(resource_size_t paddr,unsigned long size)56 static inline void __init sme_early_decrypt(resource_size_t paddr,
57 unsigned long size) { }
58
sme_map_bootdata(char * real_mode_data)59 static inline void __init sme_map_bootdata(char *real_mode_data) { }
sme_unmap_bootdata(char * real_mode_data)60 static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
61
sme_early_init(void)62 static inline void __init sme_early_init(void) { }
63
sme_encrypt_kernel(struct boot_params * bp)64 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
sme_enable(struct boot_params * bp)65 static inline void __init sme_enable(struct boot_params *bp) { }
66
67 #endif /* CONFIG_AMD_MEM_ENCRYPT */
68
69 /*
70 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
71 * writing to or comparing values from the cr3 register. Having the
72 * encryption mask set in cr3 enables the PGD entry to be encrypted and
73 * avoid special case handling of PGD allocations.
74 */
75 #define __sme_pa(x) (__pa(x) | sme_me_mask)
76 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
77
78 #endif /* __ASSEMBLY__ */
79
80 #endif /* __X86_MEM_ENCRYPT_H__ */
81