/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* AMD Memory Encryption Support
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*
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* Copyright (C) 2016 Advanced Micro Devices, Inc.
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*
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* Author: Tom Lendacky <thomas.lendacky@amd.com>
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*/
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#ifndef __X86_MEM_ENCRYPT_H__
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#define __X86_MEM_ENCRYPT_H__
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#ifndef __ASSEMBLY__
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#include <linux/init.h>
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#include <linux/cc_platform.h>
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#include <asm/bootparam.h>
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#ifdef CONFIG_AMD_MEM_ENCRYPT
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extern u64 sme_me_mask;
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extern u64 sev_status;
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extern bool sev_enabled;
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void sme_encrypt_execute(unsigned long encrypted_kernel_vaddr,
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unsigned long decrypted_kernel_vaddr,
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unsigned long kernel_len,
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unsigned long encryption_wa,
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unsigned long encryption_pgd);
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void __init sme_early_encrypt(resource_size_t paddr,
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unsigned long size);
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void __init sme_early_decrypt(resource_size_t paddr,
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unsigned long size);
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void __init sme_map_bootdata(char *real_mode_data);
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void __init sme_unmap_bootdata(char *real_mode_data);
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void __init sme_early_init(void);
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void __init sme_encrypt_kernel(struct boot_params *bp);
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void __init sme_enable(struct boot_params *bp);
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int __init early_set_memory_decrypted(unsigned long vaddr, unsigned long size);
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int __init early_set_memory_encrypted(unsigned long vaddr, unsigned long size);
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void __init mem_encrypt_free_decrypted_mem(void);
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void __init sev_es_init_vc_handling(void);
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bool sme_active(void);
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bool sev_active(void);
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bool sev_es_active(void);
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void __init mem_encrypt_init(void);
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#define __bss_decrypted __section(".bss..decrypted")
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#else /* !CONFIG_AMD_MEM_ENCRYPT */
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#define sme_me_mask 0ULL
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static inline void __init sme_early_encrypt(resource_size_t paddr,
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unsigned long size) { }
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static inline void __init sme_early_decrypt(resource_size_t paddr,
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unsigned long size) { }
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static inline void __init sme_map_bootdata(char *real_mode_data) { }
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static inline void __init sme_unmap_bootdata(char *real_mode_data) { }
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static inline void __init sme_early_init(void) { }
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static inline void __init sme_encrypt_kernel(struct boot_params *bp) { }
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static inline void __init sme_enable(struct boot_params *bp) { }
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static inline void sev_es_init_vc_handling(void) { }
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static inline bool sme_active(void) { return false; }
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static inline bool sev_active(void) { return false; }
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static inline bool sev_es_active(void) { return false; }
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static inline int __init
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early_set_memory_decrypted(unsigned long vaddr, unsigned long size) { return 0; }
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static inline int __init
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early_set_memory_encrypted(unsigned long vaddr, unsigned long size) { return 0; }
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static inline void mem_encrypt_free_decrypted_mem(void) { }
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static inline void mem_encrypt_init(void) { }
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#define __bss_decrypted
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#endif /* CONFIG_AMD_MEM_ENCRYPT */
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/*
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* The __sme_pa() and __sme_pa_nodebug() macros are meant for use when
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* writing to or comparing values from the cr3 register. Having the
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* encryption mask set in cr3 enables the PGD entry to be encrypted and
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* avoid special case handling of PGD allocations.
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*/
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#define __sme_pa(x) (__pa(x) | sme_me_mask)
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#define __sme_pa_nodebug(x) (__pa_nodebug(x) | sme_me_mask)
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extern char __start_bss_decrypted[], __end_bss_decrypted[], __start_bss_decrypted_unused[];
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static inline bool mem_encrypt_active(void)
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{
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return sme_me_mask;
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}
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static inline u64 sme_get_me_mask(void)
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{
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return sme_me_mask;
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}
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#endif /* __ASSEMBLY__ */
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#endif /* __X86_MEM_ENCRYPT_H__ */
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