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
21 extern u64 sme_me_mask;
22 extern u64 sev_status;
23 extern bool sev_enabled;
24
25 void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
26 unsigned long decrypted_kernel_vaddr,
27 unsigned long kernel_len,
28 unsigned long encryption_wa,
29 unsigned long encryption_pgd);
30
31 void __init sme_early_encrypt(resource_size_t paddr,
32 unsigned long size);
33 void __init sme_early_decrypt(resource_size_t paddr,
34 unsigned long size);
35
36 void __init sme_map_bootdata(char *real_mode_data);
37 void __init sme_unmap_bootdata(char *real_mode_data);
38
39 void __init sme_early_init(void);
40
41 void __init sme_encrypt_kernel(struct boot_params *bp);
42 void __init sme_enable(struct boot_params *bp);
43
44 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
45 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
46
47 void __init mem_encrypt_free_decrypted_mem(void);
48
49 /* Architecture __weak replacement functions */
50 void __init mem_encrypt_init(void);
51
52 void __init sev_es_init_vc_handling(void);
53 bool sme_active(void);
54 bool sev_active(void);
55 bool sev_es_active(void);
56
57 #define __bss_decrypted __section(".bss..decrypted")
58
59 #else /* !CONFIG_AMD_MEM_ENCRYPT */
60
61 #define sme_me_mask 0ULL
62
sme_early_encrypt(resource_size_t paddr,unsigned long size)63 static inline void __init sme_early_encrypt(resource_size_t paddr,
64 unsigned long size) { }
sme_early_decrypt(resource_size_t paddr,unsigned long size)65 static inline void __init sme_early_decrypt(resource_size_t paddr,
66 unsigned long size) { }
67
sme_map_bootdata(char * real_mode_data)68 static inline void __init sme_map_bootdata(char *real_mode_data) { }
sme_unmap_bootdata(char * real_mode_data)69 static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
70
sme_early_init(void)71 static inline void __init sme_early_init(void) { }
72
sme_encrypt_kernel(struct boot_params * bp)73 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
sme_enable(struct boot_params * bp)74 static inline void __init sme_enable(struct boot_params *bp) { }
75
sev_es_init_vc_handling(void)76 static inline void sev_es_init_vc_handling(void) { }
sme_active(void)77 static inline bool sme_active(void) { return false; }
sev_active(void)78 static inline bool sev_active(void) { return false; }
sev_es_active(void)79 static inline bool sev_es_active(void) { return false; }
80
81 static inline int __init
early_set_memory_decrypted(unsigned long vaddr,unsigned long size)82 early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
83 static inline int __init
early_set_memory_encrypted(unsigned long vaddr,unsigned long size)84 early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
85
mem_encrypt_free_decrypted_mem(void)86 static inline void mem_encrypt_free_decrypted_mem(void) { }
87
88 #define __bss_decrypted
89
90 #endif /* CONFIG_AMD_MEM_ENCRYPT */
91
92 /*
93 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
94 * writing to or comparing values from the cr3 register. Having the
95 * encryption mask set in cr3 enables the PGD entry to be encrypted and
96 * avoid special case handling of PGD allocations.
97 */
98 #define __sme_pa(x) (__pa(x) | sme_me_mask)
99 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
100
101 extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
102
mem_encrypt_active(void)103 static inline bool mem_encrypt_active(void)
104 {
105 return sme_me_mask;
106 }
107
sme_get_me_mask(void)108 static inline u64 sme_get_me_mask(void)
109 {
110 return sme_me_mask;
111 }
112
113 #endif /* __ASSEMBLY__ */
114
115 #endif /* __X86_MEM_ENCRYPT_H__ */
116
