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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
7struct arm64_mem_crypt_ops {
8 int (*encrypt)(unsigned long addr, int numpages);
9 int (*decrypt)(unsigned long addr, int numpages);
10};
11
12int arm64_mem_crypt_ops_register(const struct arm64_mem_crypt_ops *ops);
13
14int set_memory_encrypted(unsigned long addr, int numpages);
15int set_memory_decrypted(unsigned long addr, int numpages);
16
17int realm_register_memory_enc_ops(void);
18
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 */