LXR linux/arch/x86/include/asm/mem

   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
  21extern u64 sme_me_mask;
  22extern u64 sev_status;
  23extern bool sev_enabled;
  24
  25void 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
  31void __init sme_early_encrypt(resource_size_t paddr,
  32                              unsigned long size);
  33void __init sme_early_decrypt(resource_size_t paddr,
  34                              unsigned long size);
  35
  36void __init sme_map_bootdata(char *real_mode_data);
  37void __init sme_unmap_bootdata(char *real_mode_data);
  38
  39void __init sme_early_init(void);
  40void __init sev_setup_arch(void);
  41
  42void __init sme_encrypt_kernel(struct boot_params *bp);
  43void __init sme_enable(struct boot_params *bp);
  44
  45int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
  46int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
  47
  48void __init mem_encrypt_free_decrypted_mem(void);
  49
  50/* Architecture __weak replacement functions */
  51void __init mem_encrypt_init(void);
  52
  53void __init sev_es_init_vc_handling(void);
  54bool sme_active(void);
  55bool sev_active(void);
  56bool 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
  64static inline void __init sme_early_encrypt(resource_size_t paddr,
  65                                            unsigned long size) { }
  66static inline void __init sme_early_decrypt(resource_size_t paddr,
  67                                            unsigned long size) { }
  68
  69static inline void __init sme_map_bootdata(char *real_mode_data) { }
  70static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
  71
  72static inline void __init sme_early_init(void) { }
  73static inline void __init sev_setup_arch(void) { }
  74
  75static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
  76static inline void __init sme_enable(struct boot_params *bp) { }
  77
  78static inline void sev_es_init_vc_handling(void) { }
  79static inline bool sme_active(void) { return false; }
  80static inline bool sev_active(void) { return false; }
  81static inline bool sev_es_active(void) { return false; }
  82
  83static inline int __init
  84early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
  85static inline int __init
  86early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
  87
  88static 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
 103extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
 104
 105static inline bool mem_encrypt_active(void)
 106{
 107        return sme_me_mask;
 108}
 109
 110static 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