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1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * AMD Memory Encryption Support
4 *
5 * Copyright (C) 2016 Advanced Micro Devices, Inc.
6 *
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
8 */
9
10#ifndef __X86_MEM_ENCRYPT_H__
11#define __X86_MEM_ENCRYPT_H__
12
13#ifndef __ASSEMBLY__
14
15#include <linux/init.h>
16
17#include <asm/bootparam.h>
18
19#ifdef CONFIG_AMD_MEM_ENCRYPT
20
21extern u64 sme_me_mask;
22extern bool sev_enabled;
23
24void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
25 unsigned long decrypted_kernel_vaddr,
26 unsigned long kernel_len,
27 unsigned long encryption_wa,
28 unsigned long encryption_pgd);
29
30void __init sme_early_encrypt(resource_size_t paddr,
31 unsigned long size);
32void __init sme_early_decrypt(resource_size_t paddr,
33 unsigned long size);
34
35void __init sme_map_bootdata(char *real_mode_data);
36void __init sme_unmap_bootdata(char *real_mode_data);
37
38void __init sme_early_init(void);
39
40void __init sme_encrypt_kernel(struct boot_params *bp);
41void __init sme_enable(struct boot_params *bp);
42
43int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
44int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
45
46void __init mem_encrypt_free_decrypted_mem(void);
47
48/* Architecture __weak replacement functions */
49void __init mem_encrypt_init(void);
50
51bool sme_active(void);
52bool sev_active(void);
53
54#define __bss_decrypted __attribute__((__section__(".bss..decrypted")))
55
56#else /* !CONFIG_AMD_MEM_ENCRYPT */
57
58#define sme_me_mask 0ULL
59
60static 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
65static inline void __init sme_map_bootdata(char *real_mode_data) { }
66static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
67
68static inline void __init sme_early_init(void) { }
69
70static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
71static inline void __init sme_enable(struct boot_params *bp) { }
72
73static inline bool sme_active(void) { return false; }
74static inline bool sev_active(void) { return false; }
75
76static 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
81static inline void mem_encrypt_free_decrypted_mem(void) { }
82
83#define __bss_decrypted
84
85#endif /* CONFIG_AMD_MEM_ENCRYPT */
86
87/*
88 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
89 * writing to or comparing values from the cr3 register. Having the
90 * encryption mask set in cr3 enables the PGD entry to be encrypted and
91 * avoid special case handling of PGD allocations.
92 */
93#define __sme_pa(x) (__pa(x) | sme_me_mask)
94#define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
95
96extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
97
98static inline bool mem_encrypt_active(void)
99{
100 return sme_me_mask;
101}
102
103static inline u64 sme_get_me_mask(void)
104{
105 return sme_me_mask;
106}
107
108#endif /* __ASSEMBLY__ */
109
110#endif /* __X86_MEM_ENCRYPT_H__ */