1 /* SPDX-License-Identifier: GPL-2.0-only */
3 * AMD Memory Encryption Support
5 * Copyright (C) 2016 Advanced Micro Devices, Inc.
7 * Author: Tom Lendacky <thomas.lendacky@amd.com>
10 #ifndef __X86_MEM_ENCRYPT_H__
11 #define __X86_MEM_ENCRYPT_H__
15 #include <linux/init.h>
17 #include <asm/bootparam.h>
19 #ifdef CONFIG_AMD_MEM_ENCRYPT
21 extern u64 sme_me_mask;
22 extern bool sev_enabled;
24 void 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);
30 void __init sme_early_encrypt(resource_size_t paddr,
32 void __init sme_early_decrypt(resource_size_t paddr,
35 void __init sme_map_bootdata(char *real_mode_data);
36 void __init sme_unmap_bootdata(char *real_mode_data);
38 void __init sme_early_init(void);
40 void __init sme_encrypt_kernel(struct boot_params *bp);
41 void __init sme_enable(struct boot_params *bp);
43 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
44 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
46 void __init mem_encrypt_free_decrypted_mem(void);
48 /* Architecture __weak replacement functions */
49 void __init mem_encrypt_init(void);
51 bool sme_active(void);
52 bool sev_active(void);
54 #define __bss_decrypted __attribute__((__section__(".bss..decrypted")))
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 static inline void mem_encrypt_free_decrypted_mem(void) { }
83 #define __bss_decrypted
85 #endif /* CONFIG_AMD_MEM_ENCRYPT */
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.
93 #define __sme_pa(x) (__pa(x) | sme_me_mask)
94 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
96 extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
98 static inline bool mem_encrypt_active(void)
103 static inline u64 sme_get_me_mask(void)
108 #endif /* __ASSEMBLY__ */
110 #endif /* __X86_MEM_ENCRYPT_H__ */