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1 /* SPDX-License-Identifier: GPL-2.0-only */
2 /*
3  * Copyright (C) 2024 ARM Ltd.
4  */
5
6 #ifndef __ASM_RSI_H_
7 #define __ASM_RSI_H_
8
9 #include <linux/errno.h>
10 #include <linux/jump_label.h>
11 #include <asm/rsi_cmds.h>
12
13 #define RSI_PDEV_NAME "arm-cca-dev"
14
15 DECLARE_STATIC_KEY_FALSE(rsi_present);
16
17 void __init arm64_rsi_init(void);
18
19 bool __arm64_is_protected_mmio(phys_addr_t base, size_t size);
20
21 static inline bool is_realm_world(void)
22 {
23         return static_branch_unlikely(&rsi_present);
24 }
25
26 static inline int rsi_set_memory_range(phys_addr_t start, phys_addr_t end,
27                                        enum ripas state, unsigned long flags)
28 {
29         unsigned long ret;
30         phys_addr_t top;
31
32         while (start != end) {
33                 ret = rsi_set_addr_range_state(start, end, state, flags, &top);
34                 if (ret || top < start || top > end)
35                         return -EINVAL;
36                 start = top;
37         }
38
39         return 0;
40 }
41
42 /*
43  * Convert the specified range to RAM. Do not use this if you rely on the
44  * contents of a page that may already be in RAM state.
45  */
46 static inline int rsi_set_memory_range_protected(phys_addr_t start,
47                                                  phys_addr_t end)
48 {
49         return rsi_set_memory_range(start, end, RSI_RIPAS_RAM,
50                                     RSI_CHANGE_DESTROYED);
51 }
52
53 /*
54  * Convert the specified range to RAM. Do not convert any pages that may have
55  * been DESTROYED, without our permission.
56  */
57 static inline int rsi_set_memory_range_protected_safe(phys_addr_t start,
58                                                       phys_addr_t end)
59 {
60         return rsi_set_memory_range(start, end, RSI_RIPAS_RAM,
61                                     RSI_NO_CHANGE_DESTROYED);
62 }
63
64 static inline int rsi_set_memory_range_shared(phys_addr_t start,
65                                               phys_addr_t end)
66 {
67         return rsi_set_memory_range(start, end, RSI_RIPAS_EMPTY,
68                                     RSI_CHANGE_DESTROYED);
69 }
70 #endif /* __ASM_RSI_H_ */
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