1 /* 2 * Copyright (c) 2014-2018, ARM Limited and Contributors. All rights reserved. 3 * 4 * SPDX-License-Identifier: BSD-3-Clause 5 */ 6 7 #include <assert.h> 8 #include <cpu_data.h> 9 #include <debug.h> 10 #include <pmf.h> 11 #include <psci.h> 12 #include <runtime_instr.h> 13 #include <runtime_svc.h> 14 #include <sdei.h> 15 #include <smccc_helpers.h> 16 #include <spm_svc.h> 17 #include <std_svc.h> 18 #include <stdint.h> 19 #include <uuid.h> 20 21 /* Standard Service UUID */ 22 static uuid_t arm_svc_uid = { 23 {0x5b, 0x90, 0x8d, 0x10}, 24 {0x63, 0xf8}, 25 {0xe8, 0x47}, 26 0xae, 0x2d, 27 {0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2} 28 }; 29 30 /* Setup Standard Services */ 31 static int32_t std_svc_setup(void) 32 { 33 uintptr_t svc_arg; 34 int ret = 0; 35 36 svc_arg = get_arm_std_svc_args(PSCI_FID_MASK); 37 assert(svc_arg); 38 39 /* 40 * PSCI is one of the specifications implemented as a Standard Service. 41 * The `psci_setup()` also does EL3 architectural setup. 42 */ 43 if (psci_setup((const psci_lib_args_t *)svc_arg) != PSCI_E_SUCCESS) { 44 ret = 1; 45 } 46 47 #if ENABLE_SPM 48 if (spm_setup() != 0) { 49 ret = 1; 50 } 51 #endif 52 53 #if SDEI_SUPPORT 54 /* SDEI initialisation */ 55 sdei_init(); 56 #endif 57 58 return ret; 59 } 60 61 /* 62 * Top-level Standard Service SMC handler. This handler will in turn dispatch 63 * calls to PSCI SMC handler 64 */ 65 static uintptr_t std_svc_smc_handler(uint32_t smc_fid, 66 u_register_t x1, 67 u_register_t x2, 68 u_register_t x3, 69 u_register_t x4, 70 void *cookie, 71 void *handle, 72 u_register_t flags) 73 { 74 /* 75 * Dispatch PSCI calls to PSCI SMC handler and return its return 76 * value 77 */ 78 if (is_psci_fid(smc_fid)) { 79 uint64_t ret; 80 81 #if ENABLE_RUNTIME_INSTRUMENTATION 82 83 /* 84 * Flush cache line so that even if CPU power down happens 85 * the timestamp update is reflected in memory. 86 */ 87 PMF_WRITE_TIMESTAMP(rt_instr_svc, 88 RT_INSTR_ENTER_PSCI, 89 PMF_CACHE_MAINT, 90 get_cpu_data(cpu_data_pmf_ts[CPU_DATA_PMF_TS0_IDX])); 91 #endif 92 93 ret = psci_smc_handler(smc_fid, x1, x2, x3, x4, 94 cookie, handle, flags); 95 96 #if ENABLE_RUNTIME_INSTRUMENTATION 97 PMF_CAPTURE_TIMESTAMP(rt_instr_svc, 98 RT_INSTR_EXIT_PSCI, 99 PMF_NO_CACHE_MAINT); 100 #endif 101 102 SMC_RET1(handle, ret); 103 } 104 105 #if ENABLE_SPM 106 /* 107 * Dispatch SPM calls to SPM SMC handler and return its return 108 * value 109 */ 110 if (is_spm_fid(smc_fid)) { 111 return spm_smc_handler(smc_fid, x1, x2, x3, x4, cookie, 112 handle, flags); 113 } 114 #endif 115 116 #if SDEI_SUPPORT 117 if (is_sdei_fid(smc_fid)) { 118 return sdei_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle, 119 flags); 120 } 121 #endif 122 123 switch (smc_fid) { 124 case ARM_STD_SVC_CALL_COUNT: 125 /* 126 * Return the number of Standard Service Calls. PSCI is the only 127 * standard service implemented; so return number of PSCI calls 128 */ 129 SMC_RET1(handle, PSCI_NUM_CALLS); 130 131 case ARM_STD_SVC_UID: 132 /* Return UID to the caller */ 133 SMC_UUID_RET(handle, arm_svc_uid); 134 135 case ARM_STD_SVC_VERSION: 136 /* Return the version of current implementation */ 137 SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR); 138 139 default: 140 WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid); 141 SMC_RET1(handle, SMC_UNK); 142 } 143 } 144 145 /* Register Standard Service Calls as runtime service */ 146 DECLARE_RT_SVC( 147 std_svc, 148 149 OEN_STD_START, 150 OEN_STD_END, 151 SMC_TYPE_FAST, 152 std_svc_setup, 153 std_svc_smc_handler 154 ); 155