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/*
* AMD Memory Encryption Support
*
* Copyright (C) 2016 Advanced Micro Devices, Inc.
*
* Author: Tom Lendacky <thomas.lendacky@amd.com>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#ifndef __X86_MEM_ENCRYPT_H__
#define __X86_MEM_ENCRYPT_H__
#ifndef __ASSEMBLY__
#include <linux/init.h>
#ifdef CONFIG_AMD_MEM_ENCRYPT
extern unsigned long sme_me_mask;
void __init sme_early_encrypt(resource_size_t paddr,
unsigned long size);
void __init sme_early_decrypt(resource_size_t paddr,
unsigned long size);
void __init sme_early_init(void);
void __init sme_encrypt_kernel(void);
void __init sme_enable(void);
#else /* !CONFIG_AMD_MEM_ENCRYPT */
#define sme_me_mask 0UL
static inline void __init sme_early_encrypt(resource_size_t paddr,
unsigned long size) { }
static inline void __init sme_early_decrypt(resource_size_t paddr,
unsigned long size) { }
static inline void __init sme_early_init(void) { }
static inline void __init sme_encrypt_kernel(void) { }
static inline void __init sme_enable(void) { }
#endif /* CONFIG_AMD_MEM_ENCRYPT */
/*
* The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
* writing to or comparing values from the cr3 register. Having the
* encryption mask set in cr3 enables the PGD entry to be encrypted and
* avoid special case handling of PGD allocations.
*/
#define __sme_pa(x) (__pa(x) | sme_me_mask)
#define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
#endif /* __ASSEMBLY__ */
#endif /* __X86_MEM_ENCRYPT_H__ */
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