mem_encrypt.h

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