1 /* SPDX-License-Identifier: GPL-2.0-only */ 2 /* 3 * Copyright (C) 2023 ARM Ltd. 4 */ 5 6 #ifndef __ASM_RSI_CMDS_H 7 #define __ASM_RSI_CMDS_H 8 9 #include <linux/arm-smccc.h> 10 #include <linux/string.h> 11 #include <asm/memory.h> 12 13 #include <asm/rsi_smc.h> 14 15 #define RSI_GRANULE_SHIFT 12 16 #define RSI_GRANULE_SIZE (_AC(1, UL) << RSI_GRANULE_SHIFT) 17 18 enum ripas { 19 RSI_RIPAS_EMPTY = 0, 20 RSI_RIPAS_RAM = 1, 21 RSI_RIPAS_DESTROYED = 2, 22 RSI_RIPAS_DEV = 3, 23 }; 24 25 static inline unsigned long rsi_request_version(unsigned long req, 26 unsigned long *out_lower, 27 unsigned long *out_higher) 28 { 29 struct arm_smccc_res res; 30 31 arm_smccc_smc(SMC_RSI_ABI_VERSION, req, 0, 0, 0, 0, 0, 0, &res); 32 33 if (out_lower) 34 *out_lower = res.a1; 35 if (out_higher) 36 *out_higher = res.a2; 37 38 return res.a0; 39 } 40 41 static inline unsigned long rsi_get_realm_config(struct realm_config *cfg) 42 { 43 struct arm_smccc_res res; 44 45 arm_smccc_smc(SMC_RSI_REALM_CONFIG, virt_to_phys(cfg), 46 0, 0, 0, 0, 0, 0, &res); 47 return res.a0; 48 } 49 50 static inline unsigned long rsi_ipa_state_get(phys_addr_t start, 51 phys_addr_t end, 52 enum ripas *state, 53 phys_addr_t *top) 54 { 55 struct arm_smccc_res res; 56 57 arm_smccc_smc(SMC_RSI_IPA_STATE_GET, 58 start, end, 0, 0, 0, 0, 0, 59 &res); 60 61 if (res.a0 == RSI_SUCCESS) { 62 if (top) 63 *top = res.a1; 64 if (state) 65 *state = res.a2; 66 } 67 68 return res.a0; 69 } 70 71 static inline long rsi_set_addr_range_state(phys_addr_t start, 72 phys_addr_t end, 73 enum ripas state, 74 unsigned long flags, 75 phys_addr_t *top) 76 { 77 struct arm_smccc_res res; 78 79 arm_smccc_smc(SMC_RSI_IPA_STATE_SET, start, end, state, 80 flags, 0, 0, 0, &res); 81 82 if (top) 83 *top = res.a1; 84 85 if (res.a2 != RSI_ACCEPT) 86 return -EPERM; 87 88 return res.a0; 89 } 90 91 /** 92 * rsi_attestation_token_init - Initialise the operation to retrieve an 93 * attestation token. 94 * 95 * @challenge: The challenge data to be used in the attestation token 96 * generation. 97 * @size: Size of the challenge data in bytes. 98 * 99 * Initialises the attestation token generation and returns an upper bound 100 * on the attestation token size that can be used to allocate an adequate 101 * buffer. The caller is expected to subsequently call 102 * rsi_attestation_token_continue() to retrieve the attestation token data on 103 * the same CPU. 104 * 105 * Returns: 106 * On success, returns the upper limit of the attestation report size. 107 * Otherwise, -EINVAL 108 */ 109 static inline long 110 rsi_attestation_token_init(const u8 *challenge, unsigned long size) 111 { 112 struct arm_smccc_1_2_regs regs = { 0 }; 113 114 /* The challenge must be at least 32bytes and at most 64bytes */ 115 if (!challenge || size < 32 || size > 64) 116 return -EINVAL; 117 118 regs.a0 = SMC_RSI_ATTESTATION_TOKEN_INIT; 119 memcpy(®s.a1, challenge, size); 120 arm_smccc_1_2_smc(®s, ®s); 121 122 if (regs.a0 == RSI_SUCCESS) 123 return regs.a1; 124 125 return -EINVAL; 126 } 127 128 /** 129 * rsi_attestation_token_continue - Continue the operation to retrieve an 130 * attestation token. 131 * 132 * @granule: {I}PA of the Granule to which the token will be written. 133 * @offset: Offset within Granule to start of buffer in bytes. 134 * @size: The size of the buffer. 135 * @len: The number of bytes written to the buffer. 136 * 137 * Retrieves up to a RSI_GRANULE_SIZE worth of token data per call. The caller 138 * is expected to call rsi_attestation_token_init() before calling this 139 * function to retrieve the attestation token. 140 * 141 * Return: 142 * * %RSI_SUCCESS - Attestation token retrieved successfully. 143 * * %RSI_INCOMPLETE - Token generation is not complete. 144 * * %RSI_ERROR_INPUT - A parameter was not valid. 145 * * %RSI_ERROR_STATE - Attestation not in progress. 146 */ 147 static inline unsigned long rsi_attestation_token_continue(phys_addr_t granule, 148 unsigned long offset, 149 unsigned long size, 150 unsigned long *len) 151 { 152 struct arm_smccc_res res; 153 154 arm_smccc_1_1_invoke(SMC_RSI_ATTESTATION_TOKEN_CONTINUE, 155 granule, offset, size, 0, &res); 156 157 if (len) 158 *len = res.a1; 159 return res.a0; 160 } 161 162 #endif /* __ASM_RSI_CMDS_H */ 163