tjh.dev
Linux kernel mirror (for testing)
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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
15DECLARE_STATIC_KEY_FALSE(rsi_present);
16
17void __init arm64_rsi_init(void);
18
19bool __arm64_is_protected_mmio(phys_addr_t base, size_t size);
20
21static inline bool is_realm_world(void)
22{
23 return static_branch_unlikely(&rsi_present);
24}
25
26static 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 */
46static 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 */
57static 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
64static 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_ */