1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 #ifndef __ASM_MEM_ENCRYPT_H 3 #define __ASM_MEM_ENCRYPT_H 4 5 #include <asm/rsi.h> 6 7 struct arm64_mem_crypt_ops { 8 int (*encrypt)(unsigned long addr, int numpages); 9 int (*decrypt)(unsigned long addr, int numpages); 10 }; 11 12 int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops); 13 14 int set_memory_encrypted(unsigned long addr, int numpages); 15 int set_memory_decrypted(unsigned long addr, int numpages); 16 17 int realm_register_memory_enc_ops(void); 18 force_dma_unencrypted(struct device * dev)19static inline bool force_dma_unencrypted(struct device *dev) 20 { 21 return is_realm_world(); 22 } 23 24 /* 25 * For Arm CCA guests, canonical addresses are "encrypted", so no changes 26 * required for dma_addr_encrypted(). 27 * The unencrypted DMA buffers must be accessed via the unprotected IPA, 28 * "top IPA bit" set. 29 */ 30 #define dma_addr_unencrypted(x) ((x) | PROT_NS_SHARED) 31 32 /* Clear the "top" IPA bit while converting back */ 33 #define dma_addr_canonical(x) ((x) & ~PROT_NS_SHARED) 34 35 #endif /* __ASM_MEM_ENCRYPT_H */ 36