arch/x86/include/asm/mem_encrypt.h

   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 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 /* Architecture __weak replacement functions */
  49 void __init mem_encrypt_init(void);
  50
  51 void swiotlb_set_mem_attributes(void *vaddr, unsigned long size);
  52
  53 bool sme_active(void);
  54 bool sev_active(void);
  55
  56 #else   /* !CONFIG_AMD_MEM_ENCRYPT */
  57
  58 #define sme_me_mask     0ULL
  59
  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) { }
  64
  65 static inline void __init sme_map_bootdata(char *real_mode_data) { }
  66 static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
  67
  68 static inline void __init sme_early_init(void) { }
  69
  70 static inline void __init sme_encrypt_kernel(void) { }
  71 static inline void __init sme_enable(struct boot_params *bp) { }
  72
  73 static inline bool sme_active(void) { return false; }
  74 static inline bool sev_active(void) { return false; }
  75
  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; }
  80
  81 #endif  /* CONFIG_AMD_MEM_ENCRYPT */
  82
  83 /*
  84  * The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
  85  * writing to or comparing values from the cr3 register.  Having the
  86  * encryption mask set in cr3 enables the PGD entry to be encrypted and
  87  * avoid special case handling of PGD allocations.
  88  */
  89 #define __sme_pa(x)             (__pa(x) | sme_me_mask)
  90 #define __sme_pa_nodebug(x)     (__pa_nodebug(x) | sme_me_mask)
  91
  92 #endif  /* __ASSEMBLY__ */
  93
  94 #endif  /* __X86_MEM_ENCRYPT_H__ */