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Tom Lendacky7744ccd2017-07-17 16:10:03 -05001/*
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
Tom Lendacky5868f362017-07-17 16:10:05 -050018#include <linux/init.h>
19
Tom Lendackyaca20d52017-07-17 16:10:35 -050020#include <asm/bootparam.h>
21
Tom Lendacky7744ccd2017-07-17 16:10:03 -050022#ifdef CONFIG_AMD_MEM_ENCRYPT
23
Borislav Petkov21d9bb42017-09-07 11:38:37 +020024extern u64 sme_me_mask;
Tom Lendacky7744ccd2017-07-17 16:10:03 -050025
Tom Lendacky6ebcb062017-07-17 16:10:32 -050026void 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
Tom Lendacky7f8b7e72017-07-17 16:10:10 -050032void __init sme_early_encrypt(resource_size_t paddr,
33 unsigned long size);
34void __init sme_early_decrypt(resource_size_t paddr,
35 unsigned long size);
36
Tom Lendackyb9d05202017-07-17 16:10:11 -050037void __init sme_map_bootdata(char *real_mode_data);
38void __init sme_unmap_bootdata(char *real_mode_data);
39
Tom Lendacky21729f82017-07-17 16:10:07 -050040void __init sme_early_init(void);
41
Tom Lendacky5868f362017-07-17 16:10:05 -050042void __init sme_encrypt_kernel(void);
Tom Lendackyaca20d52017-07-17 16:10:35 -050043void __init sme_enable(struct boot_params *bp);
Tom Lendacky5868f362017-07-17 16:10:05 -050044
Brijesh Singhdfaaec92017-10-20 09:30:56 -050045int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
46int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
47
Tom Lendackyc7753202017-07-17 16:10:21 -050048/* Architecture __weak replacement functions */
49void __init mem_encrypt_init(void);
50
51void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);
52
Tom Lendackyd8aa7ee2017-10-20 09:30:44 -050053bool sme_active(void);
54bool sev_active(void);
55
Tom Lendacky7744ccd2017-07-17 16:10:03 -050056#else /* !CONFIG_AMD_MEM_ENCRYPT */
57
Borislav Petkov21d9bb42017-09-07 11:38:37 +020058#define sme_me_mask 0ULL
Tom Lendacky7744ccd2017-07-17 16:10:03 -050059
Tom Lendacky7f8b7e72017-07-17 16:10:10 -050060static inline void __init sme_early_encrypt(resource_size_t paddr,
61 unsigned long size) { }
62static inline void __init sme_early_decrypt(resource_size_t paddr,
63 unsigned long size) { }
64
Tom Lendackyb9d05202017-07-17 16:10:11 -050065static inline void __init sme_map_bootdata(char *real_mode_data) { }
66static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
67
Tom Lendacky21729f82017-07-17 16:10:07 -050068static inline void __init sme_early_init(void) { }
69
Tom Lendacky5868f362017-07-17 16:10:05 -050070static inline void __init sme_encrypt_kernel(void) { }
Tom Lendackyaca20d52017-07-17 16:10:35 -050071static inline void __init sme_enable(struct boot_params *bp) { }
Tom Lendacky5868f362017-07-17 16:10:05 -050072
Tom Lendackyd8aa7ee2017-10-20 09:30:44 -050073static inline bool sme_active(void) { return false; }
74static inline bool sev_active(void) { return false; }
75
Brijesh Singhdfaaec92017-10-20 09:30:56 -050076static inline int __init
77early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
78static inline int __init
79early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
80
Tom Lendacky7744ccd2017-07-17 16:10:03 -050081#endif /* CONFIG_AMD_MEM_ENCRYPT */
82
Tom Lendacky21729f82017-07-17 16:10:07 -050083/*
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.
88 */
89#define __sme_pa(x) (__pa(x) | sme_me_mask)
90#define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
91
Tom Lendacky7744ccd2017-07-17 16:10:03 -050092#endif /* __ASSEMBLY__ */
93
94#endif /* __X86_MEM_ENCRYPT_H__ */