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 unsigned long 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     0UL
  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__ */