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 void __init sev_setup_arch(void); 41 42 void __init sme_encrypt_kernel(struct boot_params *bp); 43 void __init sme_enable(struct boot_params *bp); 44 45 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size); 46 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size); 47 48 void __init mem_encrypt_free_decrypted_mem(void); 49 50 /* Architecture __weak replacement functions */ 51 void __init mem_encrypt_init(void); 52 53 void __init sev_es_init_vc_handling(void); 54 bool sme_active(void); 55 bool sev_active(void); 56 bool sev_es_active(void); 57 58 #define __bss_decrypted __section(".bss..decrypted") 59 60 #else /* !CONFIG_AMD_MEM_ENCRYPT */ 61 62 #define sme_me_mask 0ULL 63 64 static inline void __init sme_early_encrypt(resource_size_t paddr, 65 unsigned long size) { } 66 static inline void __init sme_early_decrypt(resource_size_t paddr, 67 unsigned long size) { } 68 69 static inline void __init sme_map_bootdata(char *real_mode_data) { } 70 static inline void __init sme_unmap_bootdata(char *real_mode_data) { } 71 72 static inline void __init sme_early_init(void) { } 73 static inline void __init sev_setup_arch(void) { } 74 75 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { } 76 static inline void __init sme_enable(struct boot_params *bp) { } 77 78 static inline void sev_es_init_vc_handling(void) { } 79 static inline bool sme_active(void) { return false; } 80 static inline bool sev_active(void) { return false; } 81 static inline bool sev_es_active(void) { return false; } 82 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 88 static inline void mem_encrypt_free_decrypted_mem(void) { } 89 90 #define __bss_decrypted 91 92 #endif /* CONFIG_AMD_MEM_ENCRYPT */ 93 94 /* 95 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when 96 * writing to or comparing values from the cr3 register. Having the 97 * encryption mask set in cr3 enables the PGD entry to be encrypted and 98 * avoid special case handling of PGD allocations. 99 */ 100 #define __sme_pa(x) (__pa(x) | sme_me_mask) 101 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask) 102 103 extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[]; 104 105 static inline bool mem_encrypt_active(void) 106 { 107 return sme_me_mask; 108 } 109 110 static inline u64 sme_get_me_mask(void) 111 { 112 return sme_me_mask; 113 } 114 115 #endif /* __ASSEMBLY__ */ 116 117 #endif /* __X86_MEM_ENCRYPT_H__ */ 118