1 /* 2 * Copyright (c) 2014-2021, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <stdint.h> 9 10 #include <common/debug.h> 11 #include <common/runtime_svc.h> 12 #include <lib/el3_runtime/cpu_data.h> 13 #include <lib/pmf/pmf.h> 14 #include <lib/psci/psci.h> 15 #include <lib/runtime_instr.h> 16 #include <services/sdei.h> 17 #include <services/spm_mm_svc.h> 18 #include <services/spmd_svc.h> 19 #include <services/std_svc.h> 20 #include <services/trng_svc.h> 21 #include <smccc_helpers.h> 22 #include <tools_share/uuid.h> 23 24 /* Standard Service UUID */ 25 static uuid_t arm_svc_uid = { 26 {0x5b, 0x90, 0x8d, 0x10}, 27 {0x63, 0xf8}, 28 {0xe8, 0x47}, 29 0xae, 0x2d, 30 {0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2} 31 }; 32 33 /* Setup Standard Services */ 34 static int32_t std_svc_setup(void) 35 { 36 uintptr_t svc_arg; 37 int ret = 0; 38 39 svc_arg = get_arm_std_svc_args(PSCI_FID_MASK); 40 assert(svc_arg); 41 42 /* 43 * PSCI is one of the specifications implemented as a Standard Service. 44 * The `psci_setup()` also does EL3 architectural setup. 45 */ 46 if (psci_setup((const psci_lib_args_t *)svc_arg) != PSCI_E_SUCCESS) { 47 ret = 1; 48 } 49 50 #if SPM_MM 51 if (spm_mm_setup() != 0) { 52 ret = 1; 53 } 54 #endif 55 56 #if defined(SPD_spmd) 57 if (spmd_setup() != 0) { 58 ret = 1; 59 } 60 #endif 61 62 #if SDEI_SUPPORT 63 /* SDEI initialisation */ 64 sdei_init(); 65 #endif 66 67 trng_setup(); 68 69 return ret; 70 } 71 72 /* 73 * Top-level Standard Service SMC handler. This handler will in turn dispatch 74 * calls to PSCI SMC handler 75 */ 76 static uintptr_t std_svc_smc_handler(uint32_t smc_fid, 77 u_register_t x1, 78 u_register_t x2, 79 u_register_t x3, 80 u_register_t x4, 81 void *cookie, 82 void *handle, 83 u_register_t flags) 84 { 85 if (((smc_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_32) { 86 /* 32-bit SMC function, clear top parameter bits */ 87 88 x1 &= UINT32_MAX; 89 x2 &= UINT32_MAX; 90 x3 &= UINT32_MAX; 91 x4 &= UINT32_MAX; 92 } 93 94 /* 95 * Dispatch PSCI calls to PSCI SMC handler and return its return 96 * value 97 */ 98 if (is_psci_fid(smc_fid)) { 99 uint64_t ret; 100 101 #if ENABLE_RUNTIME_INSTRUMENTATION 102 103 /* 104 * Flush cache line so that even if CPU power down happens 105 * the timestamp update is reflected in memory. 106 */ 107 PMF_WRITE_TIMESTAMP(rt_instr_svc, 108 RT_INSTR_ENTER_PSCI, 109 PMF_CACHE_MAINT, 110 get_cpu_data(cpu_data_pmf_ts[CPU_DATA_PMF_TS0_IDX])); 111 #endif 112 113 ret = psci_smc_handler(smc_fid, x1, x2, x3, x4, 114 cookie, handle, flags); 115 116 #if ENABLE_RUNTIME_INSTRUMENTATION 117 PMF_CAPTURE_TIMESTAMP(rt_instr_svc, 118 RT_INSTR_EXIT_PSCI, 119 PMF_NO_CACHE_MAINT); 120 #endif 121 122 SMC_RET1(handle, ret); 123 } 124 125 #if SPM_MM 126 /* 127 * Dispatch SPM calls to SPM SMC handler and return its return 128 * value 129 */ 130 if (is_spm_mm_fid(smc_fid)) { 131 return spm_mm_smc_handler(smc_fid, x1, x2, x3, x4, cookie, 132 handle, flags); 133 } 134 #endif 135 136 #if defined(SPD_spmd) 137 /* 138 * Dispatch FFA calls to the FFA SMC handler implemented by the SPM 139 * dispatcher and return its return value 140 */ 141 if (is_ffa_fid(smc_fid)) { 142 return spmd_smc_handler(smc_fid, x1, x2, x3, x4, cookie, 143 handle, flags); 144 } 145 #endif 146 147 #if SDEI_SUPPORT 148 if (is_sdei_fid(smc_fid)) { 149 return sdei_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle, 150 flags); 151 } 152 #endif 153 154 #if TRNG_SUPPORT 155 if (is_trng_fid(smc_fid)) { 156 return trng_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle, 157 flags); 158 } 159 #endif 160 161 switch (smc_fid) { 162 case ARM_STD_SVC_CALL_COUNT: 163 /* 164 * Return the number of Standard Service Calls. PSCI is the only 165 * standard service implemented; so return number of PSCI calls 166 */ 167 SMC_RET1(handle, PSCI_NUM_CALLS); 168 169 case ARM_STD_SVC_UID: 170 /* Return UID to the caller */ 171 SMC_UUID_RET(handle, arm_svc_uid); 172 173 case ARM_STD_SVC_VERSION: 174 /* Return the version of current implementation */ 175 SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR); 176 177 default: 178 WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid); 179 SMC_RET1(handle, SMC_UNK); 180 } 181 } 182 183 /* Register Standard Service Calls as runtime service */ 184 DECLARE_RT_SVC( 185 std_svc, 186 187 OEN_STD_START, 188 OEN_STD_END, 189 SMC_TYPE_FAST, 190 std_svc_setup, 191 std_svc_smc_handler 192 ); 193