1 /* 2 * Copyright (c) 2014-2017, 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 <smcc_helpers.h> 15 #include <spm_svc.h> 16 #include <std_svc.h> 17 #include <stdint.h> 18 #include <uuid.h> 19 20 /* Standard Service UUID */ 21 DEFINE_SVC_UUID(arm_svc_uid, 22 0x108d905b, 0xf863, 0x47e8, 0xae, 0x2d, 23 0xc0, 0xfb, 0x56, 0x41, 0xf6, 0xe2); 24 25 /* Setup Standard Services */ 26 static int32_t std_svc_setup(void) 27 { 28 uintptr_t svc_arg; 29 int ret = 0; 30 31 svc_arg = get_arm_std_svc_args(PSCI_FID_MASK); 32 assert(svc_arg); 33 34 /* 35 * PSCI is one of the specifications implemented as a Standard Service. 36 * The `psci_setup()` also does EL3 architectural setup. 37 */ 38 if (psci_setup((const psci_lib_args_t *)svc_arg) != PSCI_E_SUCCESS) { 39 ret = 1; 40 } 41 42 #if ENABLE_SPM 43 if (spm_setup() != 0) { 44 ret = 1; 45 } 46 #endif 47 48 return ret; 49 } 50 51 /* 52 * Top-level Standard Service SMC handler. This handler will in turn dispatch 53 * calls to PSCI SMC handler 54 */ 55 uintptr_t std_svc_smc_handler(uint32_t smc_fid, 56 u_register_t x1, 57 u_register_t x2, 58 u_register_t x3, 59 u_register_t x4, 60 void *cookie, 61 void *handle, 62 u_register_t flags) 63 { 64 /* 65 * Dispatch PSCI calls to PSCI SMC handler and return its return 66 * value 67 */ 68 if (is_psci_fid(smc_fid)) { 69 uint64_t ret; 70 71 #if ENABLE_RUNTIME_INSTRUMENTATION 72 73 /* 74 * Flush cache line so that even if CPU power down happens 75 * the timestamp update is reflected in memory. 76 */ 77 PMF_WRITE_TIMESTAMP(rt_instr_svc, 78 RT_INSTR_ENTER_PSCI, 79 PMF_CACHE_MAINT, 80 get_cpu_data(cpu_data_pmf_ts[CPU_DATA_PMF_TS0_IDX])); 81 #endif 82 83 ret = psci_smc_handler(smc_fid, x1, x2, x3, x4, 84 cookie, handle, flags); 85 86 #if ENABLE_RUNTIME_INSTRUMENTATION 87 PMF_CAPTURE_TIMESTAMP(rt_instr_svc, 88 RT_INSTR_EXIT_PSCI, 89 PMF_NO_CACHE_MAINT); 90 #endif 91 92 SMC_RET1(handle, ret); 93 } 94 95 96 #if ENABLE_SPM 97 /* 98 * Dispatch SPM calls to SPM SMC handler and return its return 99 * value 100 */ 101 if (is_spm_fid(smc_fid)) { 102 return spm_smc_handler(smc_fid, x1, x2, x3, x4, cookie, 103 handle, flags); 104 } 105 #endif 106 107 switch (smc_fid) { 108 case ARM_STD_SVC_CALL_COUNT: 109 /* 110 * Return the number of Standard Service Calls. PSCI is the only 111 * standard service implemented; so return number of PSCI calls 112 */ 113 SMC_RET1(handle, PSCI_NUM_CALLS); 114 115 case ARM_STD_SVC_UID: 116 /* Return UID to the caller */ 117 SMC_UUID_RET(handle, arm_svc_uid); 118 119 case ARM_STD_SVC_VERSION: 120 /* Return the version of current implementation */ 121 SMC_RET2(handle, STD_SVC_VERSION_MAJOR, STD_SVC_VERSION_MINOR); 122 123 default: 124 WARN("Unimplemented Standard Service Call: 0x%x \n", smc_fid); 125 SMC_RET1(handle, SMC_UNK); 126 } 127 } 128 129 /* Register Standard Service Calls as runtime service */ 130 DECLARE_RT_SVC( 131 std_svc, 132 133 OEN_STD_START, 134 OEN_STD_END, 135 SMC_TYPE_FAST, 136 std_svc_setup, 137 std_svc_smc_handler 138 ); 139