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>
16 #include <linux/cc_platform.h>
18 #include <asm/bootparam.h>
20 #ifdef CONFIG_X86_MEM_ENCRYPT
21 void __init mem_encrypt_init(void);
22 void __init mem_encrypt_setup_arch(void);
24 static inline void mem_encrypt_init(void) { }
25 static inline void __init mem_encrypt_setup_arch(void) { }
28 #ifdef CONFIG_AMD_MEM_ENCRYPT
30 extern u64 sme_me_mask;
31 extern u64 sev_status;
33 void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
34 unsigned long decrypted_kernel_vaddr,
35 unsigned long kernel_len,
36 unsigned long encryption_wa,
37 unsigned long encryption_pgd);
39 void __init sme_early_encrypt(resource_size_t paddr,
41 void __init sme_early_decrypt(resource_size_t paddr,
44 void __init sme_map_bootdata(char *real_mode_data);
45 void __init sme_unmap_bootdata(char *real_mode_data);
47 void __init sme_early_init(void);
49 void __init sme_encrypt_kernel(struct boot_params *bp);
50 void __init sme_enable(struct boot_params *bp);
52 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
53 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
54 void __init early_set_mem_enc_dec_hypercall(unsigned long vaddr,
55 unsigned long size, bool enc);
57 void __init mem_encrypt_free_decrypted_mem(void);
59 void __init sev_es_init_vc_handling(void);
61 #define __bss_decrypted __section(".bss..decrypted")
63 #else /* !CONFIG_AMD_MEM_ENCRYPT */
65 #define sme_me_mask 0ULL
66 #define sev_status 0ULL
68 static inline void __init sme_early_encrypt(resource_size_t paddr,
69 unsigned long size) { }
70 static inline void __init sme_early_decrypt(resource_size_t paddr,
71 unsigned long size) { }
73 static inline void __init sme_map_bootdata(char *real_mode_data) { }
74 static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
76 static inline void __init sme_early_init(void) { }
78 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
79 static inline void __init sme_enable(struct boot_params *bp) { }
81 static inline void sev_es_init_vc_handling(void) { }
83 static inline int __init
84 early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
85 static inline int __init
86 early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
87 static inline void __init
88 early_set_mem_enc_dec_hypercall(unsigned long vaddr, unsigned long size, bool enc) {}
90 static inline void mem_encrypt_free_decrypted_mem(void) { }
92 #define __bss_decrypted
94 #endif /* CONFIG_AMD_MEM_ENCRYPT */
96 void add_encrypt_protection_map(void);
99 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
100 * writing to or comparing values from the cr3 register. Having the
101 * encryption mask set in cr3 enables the PGD entry to be encrypted and
102 * avoid special case handling of PGD allocations.
104 #define __sme_pa(x) (__pa(x) | sme_me_mask)
105 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
107 extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
109 static inline u64 sme_get_me_mask(void)
114 #endif /* __ASSEMBLY__ */
116 #endif /* __X86_MEM_ENCRYPT_H__ */