LXR linux/include/linux/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 __MEM_ENCRYPT_H__
  11#define __MEM_ENCRYPT_H__
  12
  13#ifndef __ASSEMBLY__
  14
  15#ifdef CONFIG_ARCH_HAS_MEM_ENCRYPT
  16
  17#include <asm/mem_encrypt.h>
  18
  19#else   /* !CONFIG_ARCH_HAS_MEM_ENCRYPT */
  20
  21static inline bool mem_encrypt_active(void) { return false; }
  22
  23#endif  /* CONFIG_ARCH_HAS_MEM_ENCRYPT */
  24
  25#ifdef CONFIG_AMD_MEM_ENCRYPT
  26/*
  27 * The __sme_set() and __sme_clr() macros are useful for adding or removing
  28 * the encryption mask from a value (e.g. when dealing with pagetable
  29 * entries).
  30 */
  31#define __sme_set(x)            ((x) | sme_me_mask)
  32#define __sme_clr(x)            ((x) & ~sme_me_mask)
  33#else
  34#define __sme_set(x)            (x)
  35#define __sme_clr(x)            (x)
  36#endif
  37
  38#endif  /* __ASSEMBLY__ */
  39
  40#endif  /* __MEM_ENCRYPT_H__ */
  41