1 /* 2 * AMD Memory Encryption Support 3 * 4 * Copyright (C) 2016 Advanced Micro Devices, Inc. 5 * 6 * Author: Tom Lendacky <thomas.lendacky@amd.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License version 2 as 10 * published by the Free Software Foundation. 11 */ 12 13 #ifndef __X86_MEM_ENCRYPT_H__ 14 #define __X86_MEM_ENCRYPT_H__ 15 16 #ifndef __ASSEMBLY__ 17 18 #include <linux/init.h> 19 20 #include <asm/bootparam.h> 21 22 #ifdef CONFIG_AMD_MEM_ENCRYPT 23 24 extern u64 sme_me_mask; 25 26 void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr, 27 unsigned long decrypted_kernel_vaddr, 28 unsigned long kernel_len, 29 unsigned long encryption_wa, 30 unsigned long encryption_pgd); 31 32 void __init sme_early_encrypt(resource_size_t paddr, 33 unsigned long size); 34 void __init sme_early_decrypt(resource_size_t paddr, 35 unsigned long size); 36 37 void __init sme_map_bootdata(char *real_mode_data); 38 void __init sme_unmap_bootdata(char *real_mode_data); 39 40 void __init sme_early_init(void); 41 42 void __init sme_encrypt_kernel(void); 43 void __init sme_enable(struct boot_params *bp); 44 45 /* Architecture __weak replacement functions */ 46 void __init mem_encrypt_init(void); 47 48 void swiotlb_set_mem_attributes(void *vaddr, unsigned long size); 49 50 #else /* !CONFIG_AMD_MEM_ENCRYPT */ 51 52 #define sme_me_mask 0ULL 53 54 static inline void __init sme_early_encrypt(resource_size_t paddr, 55 unsigned long size) { } 56 static inline void __init sme_early_decrypt(resource_size_t paddr, 57 unsigned long size) { } 58 59 static inline void __init sme_map_bootdata(char *real_mode_data) { } 60 static inline void __init sme_unmap_bootdata(char *real_mode_data) { } 61 62 static inline void __init sme_early_init(void) { } 63 64 static inline void __init sme_encrypt_kernel(void) { } 65 static inline void __init sme_enable(struct boot_params *bp) { } 66 67 #endif /* CONFIG_AMD_MEM_ENCRYPT */ 68 69 /* 70 * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when 71 * writing to or comparing values from the cr3 register. Having the 72 * encryption mask set in cr3 enables the PGD entry to be encrypted and 73 * avoid special case handling of PGD allocations. 74 */ 75 #define __sme_pa(x) (__pa(x) | sme_me_mask) 76 #define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask) 77 78 #endif /* __ASSEMBLY__ */ 79 80 #endif /* __X86_MEM_ENCRYPT_H__ */ 81