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 extern bool sev_enabled;
  26
  27 void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
  28                          unsigned long decrypted_kernel_vaddr,
  29                          unsigned long kernel_len,
  30                          unsigned long encryption_wa,
  31                          unsigned long encryption_pgd);
  32
  33 void __init sme_early_encrypt(resource_size_t paddr,
  34                               unsigned long size);
  35 void __init sme_early_decrypt(resource_size_t paddr,
  36                               unsigned long size);
  37
  38 void __init sme_map_bootdata(char *real_mode_data);
  39 void __init sme_unmap_bootdata(char *real_mode_data);
  40
  41 void __init sme_early_init(void);
  42
  43 void __init sme_encrypt_kernel(struct boot_params *bp);
  44 void __init sme_enable(struct boot_params *bp);
  45
  46 int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
  47 int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
  48
  49 /* Architecture __weak replacement functions */
  50 void __init mem_encrypt_init(void);
  51 void __init mem_encrypt_free_decrypted_mem(void);
  52
  53 bool sme_active(void);
  54 bool sev_active(void);
  55
  56 #define __bss_decrypted __attribute__((__section__(".bss..decrypted")))
  57
  58 #else   /* !CONFIG_AMD_MEM_ENCRYPT */
  59
  60 #define sme_me_mask     0ULL
  61
  62 static inline void __init sme_early_encrypt(resource_size_t paddr,
  63                                             unsigned long size) { }
  64 static inline void __init sme_early_decrypt(resource_size_t paddr,
  65                                             unsigned long size) { }
  66
  67 static inline void __init sme_map_bootdata(char *real_mode_data) { }
  68 static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
  69
  70 static inline void __init sme_early_init(void) { }
  71
  72 static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
  73 static inline void __init sme_enable(struct boot_params *bp) { }
  74
  75 static inline bool sme_active(void) { return false; }
  76 static inline bool sev_active(void) { return false; }
  77
  78 static inline int __init
  79 early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
  80 static inline int __init
  81 early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
  82
  83 #define __bss_decrypted
  84
  85 #endif  /* CONFIG_AMD_MEM_ENCRYPT */
  86
  87 /*
  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.
  92  */
  93 #define __sme_pa(x)             (__pa(x) | sme_me_mask)
  94 #define __sme_pa_nodebug(x)     (__pa_nodebug(x) | sme_me_mask)
  95
  96 extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
  97
  98 #endif  /* __ASSEMBLY__ */
  99
 100 #endif  /* __X86_MEM_ENCRYPT_H__ */