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 DEFINE_SVC_UUID(arm_svc_uid, 23 0x108d905b, 0xf863, 0x47e8, 0xae, 0x2d, 24 0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2); 25 26 /* Setup Standard Services */ 27 static int32_t std_svc_setup(void) 28 { 29 uintptr_t svc_arg; 30 int ret = 0; 31 32 svc_arg = get_arm_std_svc_args(PSCI_FID_MASK); 33 assert(svc_arg); 34 35 /* 36 * PSCI is one of the specifications implemented as a Standard Service. 37 * The `psci_setup()` also does EL3 architectural setup. 38 */ 39 if (psci_setup((const psci_lib_args_t *)svc_arg) != PSCI_E_SUCCESS) { 40 ret = 1; 41 } 42 43 #if ENABLE_SPM 44 if (spm_setup() != 0) { 45 ret = 1; 46 } 47 #endif 48 49 #if SDEI_SUPPORT 50 /* SDEI initialisation */ 51 sdei_init(); 52 #endif 53 54 return ret; 55 } 56 57 /* 58 * Top-level Standard Service SMC handler. This handler will in turn dispatch 59 * calls to PSCI SMC handler 60 */ 61 static uintptr_t std_svc_smc_handler(uint32_t smc_fid, 62 u_register_t x1, 63 u_register_t x2, 64 u_register_t x3, 65 u_register_t x4, 66 void *cookie, 67 void *handle, 68 u_register_t flags) 69 { 70 /* 71 * Dispatch PSCI calls to PSCI SMC handler and return its return 72 * value 73 */ 74 if (is_psci_fid(smc_fid)) { 75 uint64_t ret; 76 77 #if ENABLE_RUNTIME_INSTRUMENTATION 78 79 /* 80 * Flush cache line so that even if CPU power down happens 81 * the timestamp update is reflected in memory. 82 */ 83 PMF_WRITE_TIMESTAMP(rt_instr_svc, 84 RT_INSTR_ENTER_PSCI, 85 PMF_CACHE_MAINT, 86 get_cpu_data(cpu_data_pmf_ts[CPU_DATA_PMF_TS0_IDX])); 87 #endif 88 89 ret = psci_smc_handler(smc_fid, x1, x2, x3, x4, 90 cookie, handle, flags); 91 92 #if ENABLE_RUNTIME_INSTRUMENTATION 93 PMF_CAPTURE_TIMESTAMP(rt_instr_svc, 94 RT_INSTR_EXIT_PSCI, 95 PMF_NO_CACHE_MAINT); 96 #endif 97 98 SMC_RET1(handle, ret); 99 } 100 101 #if ENABLE_SPM 102 /* 103 * Dispatch SPM calls to SPM SMC handler and return its return 104 * value 105 */ 106 if (is_spm_fid(smc_fid)) { 107 return spm_smc_handler(smc_fid, x1, x2, x3, x4, cookie, 108 handle, flags); 109 } 110 #endif 111 112 #if SDEI_SUPPORT 113 if (is_sdei_fid(smc_fid)) { 114 return sdei_smc_handler(smc_fid, x1, x2, x3, x4, cookie, handle, 115 flags); 116 } 117 #endif 118 119 switch (smc_fid) { 120 case ARM_STD_SVC_CALL_COUNT: 121 /* 122 * Return the number of Standard Service Calls. PSCI is the only 123 * standard service implemented; so return number of PSCI calls 124 */ 125 SMC_RET1(handle, PSCI_NUM_CALLS); 126 127 case ARM_STD_SVC_UID: 128 /* Return UID to the caller */ 129 SMC_UUID_RET(handle, arm_svc_uid); 130 131 case ARM_STD_SVC_VERSION: 132 /* Return the version of current implementation */ 133 SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR); 134 135 default: 136 WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid); 137 SMC_RET1(handle, SMC_UNK); 138 } 139 } 140 141 /* Register Standard Service Calls as runtime service */ 142 DECLARE_RT_SVC( 143 std_svc, 144 145 OEN_STD_START, 146 OEN_STD_END, 147 SMC_TYPE_FAST, 148 std_svc_setup, 149 std_svc_smc_handler 150 ); 151