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