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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_rsi_is_protected(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_ */ |
| 71 |
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